MP3Tag will let you do this too.
You can use masks like for the song, eg. with the following filename:

Whitney Houston - Whitney's New Album - 21 - Million Dollar Bill (Frankie Knuckles remix) (bonus track).mp3

using the mask:
%artist% - %album% - %track% - %title%

will populate the tags for Artist, Album, Track Number, Song Title.
You can batch these as well. You can also export the tags to the filename and then back to tags again. Or use the freedb/Amazon search (does anyone know how to add Amazon.co.uk to MP3tag?) which will usually populate the important tags (Artist, Album, Song Title, Track No., Year, and sometimes Genre) as well as download album art. You can choose to embed the album art, or do what I do, and automatically save the album art to the folder with the filename cover.jpg

Hope that helps!