I will start off with Ars' first installment on their 'Understanding the Microprocessor' series, I haven't read the whole thing myself yet as I haven't had enough time but expect the usual quality stuff from Ars.
Hard Drive performance should be taken very seriously. TR has posted an IDE RAID round-up which also gives you a general idea on how you could make your data more reliable and at the same time get faster access times. x-bit has a similar article in which they compare IDE RAID setups to SCSI products... hmmm... 15,000 RPM!
While we are at it, a deserved mention to Vehementi, one of our forum regulars, who posted his take on WD's Special Edition 120GB HDD here on the boards.
Ace's Hardware also has a couple of good reads this week, the first is another put-your-a$$-in-the-know kind of article talking about Mainframes. Also a quick look to Apple's newest G4 PC is available here.