I use to be a big time MusicMatch player fan untill after the massive bloat (after 7.5). I liked it because of the cool way it does the auto tagging and simple way of adding album art.
Currently, I use
QCD and it is so much nicer than MusicMatch ever was. What makes QCD great are the many plug-ins, it doesn't have as many plug-ins as WinAmp, but I just never liked WinAmp.
Tag editor?
The
Tag and File Editor in QCD works great. QCD is completely FREE. If you have NERO installed, check out the "QCDNERO 6" plug-in...lets you burn right within QCD.
Album art utility?
I use a program called "
album cover art downloader" (duhhh)

. This utility will allow you embedded the picture into the MP3 files (ID3v2) and/or a folder artwork for thumbnail viewing. (It uses the similar "Amazon API")
As a bonus, if your like me and use FLAC, APE & OGG (lossless audio), QCD can play those (and many other type) with the added plug-in.
ps. The only thing I miss from MusicMatch is how it was able to put the album art into the wallpaper.