If I buy portal 2 for PS3, will I then have a copy for PC?

Yes. The PS3 version will come with the PC version free of charge if you link your accounts. SteamPlay is just Steam's system for games that run on multiple platforms (currently just PC and Mac) that mean that if you buy it once, you can play on both.

I'm not sure if buying it on Steam will give you the PS3 version, considering it's going to be less expensive.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.