I'm a Windows freeware developper. My latests portable apps are posted here: FoldersPopup and CSV Buddy.
My most recent app is "My Tunes Covers", a utility to manage music files covers (artwork). In its first ALPHA version (newly released today), the portable app only support iTunes libraries (and requires iTunes to work). But, in its final version, it will also support MP3 collections of files as well.
I do not expect to find lots of iTunes lovers here

It is here: http://code.jeanlalonde.ca/mytunescovers/
I'll add it to the database when it will be ready for public release.
Regards,
Jean