[1] http://www.softpointer.com/tr.htm
EDIT: thanks for the Linux alternative suggestions everyone! I have (had) mostly the same complaints about ExFalso / Puddletag / EasyTAG as the ones I posted below about Picard (never tried Beets though). But most importantly, given this olde windows tool has been working fantastic for years, I don't see any reason to migrate my config and trust and habits :)