To all, mostly russian sensation
OK, say you are playing a game based off of Ue3. OK, you have a...6800 of some sort (i realized that the 6600gt wouldnt fit for my example) and an x800 of some sort. If you played UE3 in ONLY SM2.0 (same settings) with both cards, the x800 would win most likely. BUT, if you let the x800 run at UBER graphics (only 2.0 though) and the 6800 do its uber graphics (on 3.0) i am thinking that you wouldn't see much of a performance difference between the cards, though, the 6800 might be a little slower (oh boy...it might run at 30fps, which is the STANDARD for console games) but in the end it would look alot nicer and you wouldnt see a huge hit (as compared to how much graphics it would add.) That is the basic
concept towards Sm3.0...add eye candy, improve performance. It's already slightly available with Far Cry, which was build up from 2.0, so when we see games that are built from the ground up with 3.0 in mind, then we will see the importance of it.
I think most future games will require you to play it on 3.0 if you even want it to look decent. But, as i always say, if you upgrade alot, don't worry about 2.0 and 3.0 right now. If you are like me, and upgrade once every gaming generation (4 years or so) you need to be as future proof as possible with less money spend. Therefore, i chose a 6600gt, as it performed good but had Sm3.0...i COULD have gotten a....say x800 (vanilla) if i wanted...it's faster, but only supports 2.0
If i was the type who upgrade often, i could care less about 3.0, but i'm not. So i hope you see where I get my thoughts and opinions about it.
Oh yeah, you said  "You guys are basically saying that 6200/6600/6600GT cards are more futureproof than X800Pro and X800/X850XT cards because they support SM3.0??? lol (having in mind that there is no game that shows any noticeable performance improvement with SM3.0) "
I saw some place saying that SM3.0 on far cry boosts performance of the 6800 A LOT. It actually boosts it to the point of X800pro framerates...and not only that, it looks BETTER...huh, thats odd, more eye candy with more framerate!!! woot! sm3.0 is great, and yes there is a difference. Can you imagine what games will be like that are built up from the ground with 3.0? 
When games like that are out, I wanna see someone do a test on some type of 6xxx card (preferably 6800gt or ultra) and run it in Sm2.0, 2.1, and 3.0 and see what the difference in framerate, and then compare that to how much eye candy each step up adds. I think we'll all be surprised.
Well, i was redundant there, sorry. As for now, keep up the discussion...good thing it isn't a flame war like that last SM3.0 thread 
and lets not get into SLI :-