Its got both, I use an ethernet cable when I am at my house and Wireless when I'm at my mam's house. You just have to set up the connection how you want it 

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Heh, the 80gb version has been out longer than the 40gb has been. I think the 80gb version came out around June or July, though I'm not sure? Or maybe even August.
The 80gb has the emotion engine, or the graphics synthesizer removed from it, so not all PS2 games will work on it.

Anywho, personally I still prefer 360 for a wider game selection, though I do admit PS3 has better graphics and I like the gyroscopic control idea. What ticks me off the most is the lack of games exclusive to the PS3 to utilize these features...