MusicIP Mixer is a free Windows that allows you to choose a song from your collection and it will generate a playlist of songs that it deems similar. While you can start generating playlists as soon as it's installed, the initial algorithm, though fast, seemed wanting to me, and the subsequent (and presumably more accurate) algorithm takes a long time to analyze your songs. It does have some nice features, though, like integration with other players so you send generated playlists to Winamp or iTunes, and compatability with portable devices. It also has a built-in music-recommender that will query the web for new music you might like. Though I haven't been using it long enough to really judge the quality of its algorithms, MusicIP Mixer has a nice polished feel and is worth checking out if you're sick of assembling playlists by hand.
DriveImage XML is a great backup and drive imaging tool. That pretty much says it all. It will create back-ups of in-use drives and even restore files from a drive image without restarting your PC. It works on Windows XP for FAT 12, 16, 32, and NTFS volumes. It took only a minute or two from downloading the app to start backing up, and the backup itself took about as long as you would expect, varying by the size of your drive of course. There is virtually no setup involved, though you can change some options to customize your backup or imaging job. I also like that the images are stored in XML, so it is readable from other tools later on.
Some files you downloaded and saw that they have .001, .002 extension. What kind of files are they, well, they are files that are splitted by HjSplit: a freeware file-splitter and joiner for Windows 95, 98, ME, 2000, NT, XP and Linux.You can download it hereWindows versionLinux version
