Looks like a pretty good lineup.
Can I play all of my PS2 games like guitar hero on a PS3???
And can I use my PS2 memory card on it?

Among shooters, the only one that I can think of that offers local multiplayer (other than Warhawk, but that's not a good option for you).

You still have dial-up?? Wow, i thought that they had stopped providing that service since BB is almost as cheap as dial-up is...

Well Uncharted isn't an online game and can offer loads of fun, the games listed above by Dark are also good choices :D

I live in the middle of nowhere in Vermont where the only internet available is dial-up or Finowin. (40kbs MAX download speed).

And I have scanned foe wireless and to start with there is nobody within a 1/4 mile of my house in the first place. And they're old people that wouldn't know how to use a wireless router.

I have juno...
Look it up on Wikipedia if you want to know just how bad it is.

Well, there's Rock Band, Ratchet and Clank, Resistance and Call of Duty 4 both have 4 player splitscreen, Burnout Paradise, and Uncharted is fantastic.

All those games are out. But upcoming games are:

Final Fantasy XIII, Final Fantasy Versus XIII, God of War 3, Metal Gear Solid 4, a rumored new Syphon Filter, and Motorstorm is an arcadey racing game that will have 4 player splitscreen.

Those are my reccomendations by looking at your profile.

You can play most of your PS2 games on the PS3 if you have the 80Gb, you can't with a 40Gb as it has no backward compatibility.
Guitar Hero 2 is the exception as your controller won't work on the PS3.

You can transfert your memory card onto the PS3 and then create a fake memory card on the PS3 hardrive ( you need to buy a cheap memory card adapter for the transfert, i think it cost like 10$).

I have no clue if you can transfert your saves back to the PS2 memory card after playing on the PS3 though but I don't know why anyone would want to do that.

PS : God of War 2 will definitly work on the PS3 80Gb, I had never finished it on my PS2 so restarted it from scratch on the PS3 and finished the whole game there without any problem..

 My English is fine.  Unless New England English is differnet than wherever you live English. 

If you are lucky you can get hands on a second hand backwards compatible 60GB PS3 which will allow you to play all the PSX and PS2 games.

Speaking of Guitar Hero is it good if I can get a 4star on Bark at The Moon on Expert?
And if it is good, how good is it?