One of my all time favorite programs that jouni sold to a big company that makes jv16 is RegCleaner. I have always felt satisfied with RegCleaner as a registry cleaner where jv16 would sometimes delete an active value. Its hard to find but I found it at MajorGeeks.com which is a great place to find freeware software programs.
Visual CD is a disk cataloging tool to index CD/DVDs, floppy disks, hard disks, and even folders. You can then explore the disk catalogs, search files and folders, create MP3 playlist file without having the physical disks in the drive. Upon insertion of the corresponding disk, you can open files, split files into smaller pieces, extract ZIP, RAR, and CAB archive, and more.
Fast Explorer - Manage context menus items of the shell's file objects and virtual objects displayed in a file manager, such as Explorer. Add new menu items, submenus, dividers, specify menu bitmaps and hint text, and also manage existing menu items added by other programs. http://thesoftpro.tripod.com/downloads/fe/
as NetRyder said PowerMenu I just gonna add my voice to that one, its a great little proggie, I have it run at system startup so I can send things like XChat to the system tray and shiz like that, also good for the transparency