I just bought Grand Theft Auto San Andreas the other day and it's gotten me completely addicted to the game. Some of the really cool improvements to Vice City include: more RPG feel (you have strength, respect, fat, etc... stats and you have to eat every so often or you loose energy and muscle), you can get your haircut, change all your clothes, get a tatoo, and work out at the gym to get buff. I wanted to be able to afford some of the real estate around Los Santos (the L.A.-like area), but it was all 10K and above and I only had a little over a thousand, and I wanted to get some quick cash and didn't know how I was going to do it because the missions weren't making me rich quick. Then I was exploring around Downtown Los Santos and I found this old belvedere looking car that I got into and it was a pimping car which I could do pimping missions in. The pimping missions are very lucrative, every one you do in a row adds another $300 to the cash you get every hooker you pickup (the first time it's $300, then $600, then $900, etc...).
Another thing that's cool is if you get the 10 pimps in a row goal (in addition to all the cash you get) , the game tells you that prostitutes will now pay you to be with them.