With the shear volume of programs, being able to flag programs as a favorite, or better, the ability to create user categories is almost mandatory.
 
Remembering which programs I really, really like by using crayons and bubble gum wrappers isn't realistic with this much quality content.

Someone please move this to Feature Requests

+1000 !!!

I don't even have RP, but voted in advance of what is likely an eventuality.  
 

Great request. I can see how it would be very useful.

If you do this please whatever you do make sure performance is still good afterwards and that it can be disabled if necessary.
Thanks.

I agree - even something like the rating system in CSC would be handy.

Tagging would be great.  That way if I make an ambient piano sound, I don't have to try to remember whether I put it under Ambient or Piano, just click on either tag and it will find it.