It supports Ogg, FLAC, Speex, Monkey’s Audio, MP3, Musepack, WavPack and WM and the process is really fast.
It uses a system based in the acoustic print which recognises the song and then, it searches for information about it to complete the tags.
Of course, you'll need to be online, because that information is collected from the Internet.
It also allows you to download lyrics and CD covers.
MetatOGGer is an interesting choice for all those people who want to get rid off those 'track01', 'track02' files and want to have their music collection in perfect conditions.