Tagging

Select all the songs you want to edit and hit F3 or F4 etc...

Ephpod CAN tag files, not just edit the itunes database, just check "Add id3 tag to song" and "Add id3 when editing with shortcut keys"(probably not the exact words, just look for something similar, or in the help file).
BTW this will only tag the files that are on your iPod, NOT the ones on your HD.

Pierugg

Yeah that works. It will tag all your stuff on your computer if you then take it back off the iPod. Also, when you try to edit a field where there shouldn't be identical entries (like song name) it won't let you. Now if for some reason let's say you want to edit the artist on twenty songs, highlight them all then hit (what is it F3?) whatever button artist is and type it in. It should then name all of those twenty artist entries with whatever you typed. Don't right click to edit it because that will only edit that line. You have to use the F key method. I have 2.58 and that's how my version works.