Great game – much the same as the PS2 version, but if you have a good PC then you get a lot more draw distance, and other visual goodies.
You can also save your replays with the PC version, and send them to others – great for making stunt movies, which will surely flood the fan sites soon.
The game itself is brilliant – its what you expect after playing GTA Vice City, and more. Still the great humour that the other games are known for, a good choice of music stations, and 3 HUGE cities (and the areas between them). If you like to drive (in many vehicles, or motorbikes, or bicycles, or boats, helis, planes) then it is great – so many places to explore – the cities are as big as Vice City was (each), and there are a few small towns placed between them. Also a huge mountain that takes a bit of biking skill to get up, and other stuff I probably havent found yet. The game will keep you hooked – so much stuff to do even if you are not doing the missions.
Overall San Andreas is a great successor to GTA-Vice City, and will be the game to measure all games of its type to.