I'm a pretty big fan of Media Monkey. It's free, and it works great for me.
Media Monkey supports OGG, MP3, FLAC and WMA files. And it is much more than just tagging and renaming software, it can rip CDs, convert audio files, synchronize with portable devices, burn CD/DVD, catalog your physical CDs and use the Virtual CD feature to keep track of what CDs you own.