Seeing as we're having fun, here's a couple more pretty entertaining websites:
The Top 10 Rap Songs White People Love
For the record, I don't like many of those rap songs, but I know lots of people who do.
I am firmly of the opinion that the greatest rap group of all time (excluding Run-D.M.C. which you have to say) is without question Public Enemy, particularly the album It Takes a Nation of Millions to Hold Us Back, followed closely by Fear of a Black Planet.