I am searching for a application for my PC or the Nokia 770 itself that downloads the right tag for each mp3. Often at times I have Canola showing multiple names of one album like "Red Album", "RED Album", "Red_Album" so that the album is not alltogether.

How do you guys fix this? And please don't tell me to to fix every single mp3 since I have too many.

I am using the tagger from http://www.musicbrainz.org which uses audio fingerprinting technology to identify music. The underlying database is moderated to meet simple syntax standards -> it is not possible that one artist or album has different tags.
For music that is not in the database yet i am using the mass-tag feature of amarok.

I use the following (freeware) application - http://www.mp3tag.de/en/
it's very easy to use and you can use a search facility located in the "tagsources" menu to download the correct id tag information. The best feature is it will also embed album art into the mp3 - perfect when using the Kagu media player on the 770.

Enjoy