I find it amusing at all the people getting the PS3 version claming it is the same or better as if they already have a chance to play both versions.
I think DLC is and going to be big factor in the console gaming just like how "expansion pack" is for the PC realms. You can almost always expect expansion pack for PC games if it sell even remotely "well". Heroes V, Civ IV CoH, etc all have expansion packs. This option is not feasable for console gaming since there is no game install (well unless you own a PS3 - see what I did there) so the best way to do expansion pack is DLC.
I am not sure why Rock Band and Wii are being compare to GTA4, it is entirely different. I think DLC for Rock Band factor into people purchasing. I have a "casual" gamer friend, who return Rock Band for PS2 when he found out that DLC is only for PS3 and 360. He said he will wait until he get PS3 to get Rock Band just for the fact that he will have DLC. It will not turn the tide of Wii domination but you are really comparing apple and orange here.
Sometimes it is not so much of actually of using thing like DLC but just to have the option there available if you want to use it. For awhile, I thought I want PS3 only if it is full BC, so I purchased the 60gb version thinking it would be nice to play all the PS2 games on it. It turn out I only play one or two PS2 games on my PS3, and I would have been just happy with 40gb PS3 however, it is always nice to know if I ever want to play PS2 games on my PS3 I always could.
-mysticD
