Media Monkey, the ultimate tagging solution for your music library.
The sheer comprehensiveness and number of features alone is staggering, but Media Monkey excels at one other thing; managing huge music libraries. When Windows Media Player chokes, iTunes falters and Songbird crawls away sheepishly Media Monkey can shoulder the load and display thousands of songs [...]

I just reviewed music management software Media Monkey over at gHacks today. I mentioned that it can be extended using scripts.
Today I found a great script which although it’s a little old, it still works well with the latest Media Monkey release, 3.03.
AutoRate 2.2
I would love to have all of my songs rated properly [...]