Thanks for your replies, people.
I would like for my OS to install with only essential applications and services out-of-the-box, similar to what you get with different iterations of Linux.
You hit bullseye, Davis.

The OS is Linux-based. Thus, minimalist efficiency is the motto.
No pre-installed trials or lite apps, just the OS and a web browser.
I personally don't like trial packages, but I'm not sure what you meant by "lite" apps. Do you mean stripped-down versions of commercial software? If so, no, we're not adding those. Some software, while faster, lack some convenient features. In such a case, we settle for the features if the speed difference is negligible. E.g.: Ristretto, the Xfce image viewer, while lighter, lacks a lot of features (like arrow-key navigation) which make it annoying. Eye Of Gnome, the default of the namesake, is slightly higher in memory usage, but offers a tonne more features (just not the sliding eye-candy Picasa gives...) and is thus the default in HeliumOS too.
I'm working on the "default apps" list now.
Having an option during install to disable all non-essentials would be nice.
Hmm...like it'll have a checkbox-style list "Which of these devices do you use?" Then the user can untick "Printer", "Scanner", etc. if not needed?
I really don't care much about UI unless it's intrusive or extremely inefficient. For example, I would describe the OSX UI as semi-intrusive due to the inability to hide the menu bar at the top of the screen. This eats up valuable screen space when apps are in windowed mode and creates complications when they are in full-screen mode (for example, being in full-screen mode in Chrome and wanting to access the tabs and having both menu bars drop down instead of just the one I want). Other than nitpicky stuff like that, as long as the UI is usable I'm fine with it.
I'm more used to the Win7 desktop than the Mac's, so not sure what you're talking about, though I understand it. Apart from function, the basic desktop is somewhat like this:

I brought it as close as possible to the Win7 desktop (for MS-migrants), without sacrificing too much real estate for the taskbar.
P.s.: Thanks for the video, gave me a lot to think on.

Some of the things were (are) my own personal fantasy too!
I would also like something that comes with a decent manual -- one that contains clear explanations as to its services and features. One of the most tedious things a newb confronts when installing an OS is deciding which services he or she wants running on his/her machine. I like Windows, but it takes a good deal of research to find out what all those running Windows services do, exactly. The guides I've found online are at best vague -- and MS provides very little official information about them.
Other than that, for the moment I'd say W7 and W8 are it, for me.
Aye, I too hate it when the description section of some service of app is blank. Most of the stuff has manuals ready. A detailed manual of custom/new functions would be awesome too, right?
So one point is, "tell the user what does what - system transparency". Got it.
Slim, lean and as bloatware free as possible would be the ideal operating system for me! Personally speaking, I would like an operating system that just came out if it's box to be simple, having the best of both worlds, like more older and or legacy drivers, while maintaining a good dose of modern drivers for today's hardware.
Hmm...to keep it slim and lean (our base concept) I stripped the kernel of modules for legacy hardware...I guess I should run a poll on "how old is your hardware".
Also a nice installation user interface would be nice, a simple little interface that might ask users questions in regards to how they will be using their operating system, and after just a small amount of user information is collected the operating system during the install configures itself to the users needs.
Answered above for Davis' question.
Also I might like to see a Microsoft operating system come stock with a "full" version of some sort of Microsoft Office suite, similar back to when I gave Ubuntu 10.10 a try for close to a year, if I remember right that thing came stock out of the box with Open Office suite, maybe for Microsoft they could do something like that, it would be nice.
In the testing and filtering of candidates, I found OpenOffice to be rather...heavy. For a word-processor, I loved Abiword, for spreadsheets Gnumeric, but I am still looking for a good presentation tool. So we'll work on a fuller suite later if needed.
And slightly outside the topic of an operating system, but does kind of go "hand in hand" with it, would be a more supercharged and turbocharged update system. It would be nice if say Microsoft could offer up their updates quicker and faster. And it would be ideal as far as the perfect operating system, if that it's update system could more so "bundle" their updates into just a couple packages, rather that offering up so many different individual ones, that take up more time to download and then install.
Using the Linux update system, so can't do much on that, but speed (custom tweaks in place) and transparency is top-notch.
I agree totally, basic and functional, with bells & whistles available as options for those that want them.
And I agree with you! I as a geek love to have a lot of options. Normal users, however, either due to lack of the knowledge or otherwise, don't give a damn about it.
I need it to enable me to get on with my work with minimum distraction and detour (currently OpenSuse or maybe Fedora 17 come fairly close, Windows less so at the moment).
That's the core concept, yes. For work, per se for authors, we've got no-distraction, fullscreen text editors. Well, my idea of no distractions.
Could even make a different OS flavor for each kind of user (apart from paid/commercial custom builds)...but...er...no cash for the extra storage, least we come up with a solution. Spreading out the storage to multiple accounts would be nice and somewhat a good anti-data-loss backup plan, but decentralization in administration looks worrisome.
Thank you again for your replies.
For specific implementations I'm split over options (example, the office suite and UI).
I'll have to consult with
Leeky about that before I pop it to the rest of my team.