This is an interesting problem and unfortunately I don't know the cause (or solution). Its fairly longwinded and I'm not sure how to describe it easily, so if you can try to struggle through my description and provide any advice I'd appriciate it. My Powerbook G4 came with Tiger, and I have an old G4 PowerMac that has Panther on it. In both of those OSes if you double clicked networking in the sidebar of the Finder you could see the computers on your Windows network. When Leopard came out, in the sidebar of the Finder was a list of computers on your network, making access to them quicker. It was really slick because you only had to log in once, ever. Basically what would happen is you'd single click on your Windows machine in the sidebar, and then a list of shares would come up in the main window of Finder. Then you'd double click whichever one you wanted to mount (no asking for password after your first access). I was so impressed by this I also put Leopard on my Mac Mini (intel). It also worked great, for a time.. Now both my Powerbook and Mini no longer see Windows computers in the sidebar at all (they still see their Mac brothers though). And now the only way I can connect to one of my Windows machines is to go to the Go menu -> Connect to server -> then enter the smb address (smb://Athlon64 for example). Somehow I lost that cool sidebar functionality to connect to my Windows machines and I'd like it back. Since this happened on my Mini as well as my Powerbook I don't believe its any configuration I changed on the Macs themselves because I would have had to have duplicated my changes on both machines (and I'd remember doing that). So I'm thinking maybe an update did this. Googling produces some results, but the severity of people's networking issues with Windows and Macs varies widely. Digg had a submission with several comments on problems browsing SMB shares, some of the comments are similar to my problem, but I didn't find a solution. And its not that I can't browse smb shares, I can still get to them manually, its just an inconvienence to do so. Another interesting but probably unrelated oddity is that on my Athlon64 system I have a complete drive shared. From Windows I can see and access everything on that drive, if I try to connect to that from a Mac (Mini 10.5, Powerbook 10.5, or PowerMac 10.3) I get a blank directory. As in it mounts, but I don't see any files or folders, the Macs (all of them) do correctly report the amount of free space on that drive (bottom pane of the Finder window). The Athlon64 machine is running XP SP2. I have a Vista SP1 machine that also used to show up in Leopard as described above, it no longer does. I can still connect to it through the manual method I outlined above (same as how I get to the Athlon64 machine). There should not be any permissions issues, but that brings up something interesting. If I connect to the Vista machine, I connect as Dave, which is the same account I use when using the Vista machine. I have several dirs shared on that, and when you connect through the Go menu (typing smb address) you have to choose a dir to mount. Once that dir is mounted though Main (the vista machine) shows up in the sidebar like it used to. If I click on that, it shows me all avaiable shares and I can connect to any of them without problems. If I try and connect to my Athlon64 machine for some reason (probably how I connected the first time) I'm always logged in as Guest. If I click on Connect As... as seen in the pic below The window disappears, athlon64 also disappears from the sidebar, and I'm not presented with a login screen. If I specify the user in the smb address (smb://sngx1275@Athlon64) it still logs me in as guest. This probably has nothing to do with the main problem of the Windows machines not showing up in the sidebar anymore, and I'm not all that concerned with fixing it at the moment. The real problem is I would like to get my Windows machines to show up in the sidebar again.