If you have a lot of songs to fix there are applications that claim to be able to analyze your whole music collection and supply missing metadata. I don't have experience with this one, Songgenie, but it got a great review in Macworld. There are probably similar programs for a PC.
i Tunes help
I use i Tunes to import CDs into my laptop to playback via Squeezebox Touch. Sometimes i Tunes doesn't recognize the disc (e.g. Jimmy Smith Home Cookin'...really? come on). If I let i Tunes import the disc it goes to a folder called various artists and gets mixed up with other music. I'm sure there's a simple way to move imported tracks to other albums, re-label, etc, but I haven't found it? For that matter, is there a better program to use for importing?