Taskbar Shuffle
http://www.freewebs.com/nerdcave/taskbarshuffle.htm
(also, the quick key for un-minimized is shift+windowskey+m)

Always on Top
http://www.fadsoft.net/AlwaysOnTopMaker.htm

Foxit
http://www.foxitsoftware.com/pdf/rd_intro.php

Eyedropper (dead, archive.org link)
Newest version may have memory leak issue (slows down the more you use).
http://web.archive.org/web/20061201140455/http://www.inetia.com/eyedropper_download_eng.php
Apparently autohotkey also has a similar function in their