http://www.redchairsoftware.com/notmad/
An alternative to the software from Creative Labs for importing files.
Media Center isn't too bad for default software, and is nice for updating ID3 tags but doesn't really go 'above and beyond'
This software is pretty sweet so far.
It includes a web interface so you can access the data from anywhere (also inclues an option to turn this off, or to allow only access to the local machine, and to change default port).
You can stream audio from your MP3 player through winamp/media player etc.
I'm still testing the software - so not an official recommendation yet.
Its not free

But the price is decent, if you only have one device its only 25 bucks, and there is a free version thats limited.
another nice feature is its only 1 meg download