Win7 has something called "Homegroups" which is supposed to let you share your files with other Win7 computers on the same home network, with a special password. The stupid thing about this? At least for my situation (one person, many computers of various vintages and operating systems) good old-fashioned filesharing on the network works just fine for that. I'd got[ten] used to the convenience of having (password-protected, but that's mostly transparent) write-access to the files on the desktop from whichever laptop happened to be in use in the living room. (Except the little Eee, which was so intermittent and flaky about it that I eventually threw in the towel and resorted to what we used to call "sneakernet" at work, though in my case it was usually slippernet or barefootnet; put the file on a removable medium and walk over to the destination computer with it.)
Homegroups, it turns out, doesn't let me do that. Once the silly thing was set up, I suddenly found that I could only see the files on the desktop that Windows thought I should be allowed to see -- and only with read-access, and organized by libraries. (I told you libraries were evil.) The XP machine, meanwhile, could read and write everything just fine.
The solution? Leave Homegroup, on both Win7 machines. Then I'm back where I was before, with full access to all my own files, not just the ones in stupid "Libraries." (ETA, with added growling: but I had to share the printers manually, and add them again.)
So what exactly was the point?
I'm a PC, but Windows 7 I'm having second thoughts about.