Players
VLC
The VideoLanClient player will take everything from DVDs to Ogg, to Windows media. I’m not sure if it’s a newer version, but seems nicer on OSX than I remember on Windows.
Realplayer
VLC lacks browser pluggins, so you still need realplayer.
Ripping/Encoding
AAC to MP3
I like using iTunes, but I hate using a music format that will be useless if I update to different hardware/software in future. Therefore I use JHymn. (NB: Hasn’t been updated to work with iTunes 6 yet).