Whats this thing on the side of my 6600 GT Video Card ?

That tab if it is close to the front of the card near the VGA/DVI connectors is an SLI tab. If you had another one of these cards and an SLI compatable motherboard then you could run these in SLI.

Here is a link to a picture of what I am refering too.
SLI Connect

........wow......wow......*blink* wow.......

your my hero Captain CPU , thats exactly what that tab is for. At long last i can rest my mind because i now know what the heck that thing is!

weird that u havnt heard or seen of sli slots

I know what SLI is but cant use them from what ive read because i use dual displays to run mutiple WoW accounts on the same pc so therefore found no reason to research them to point of knowing how the cards themselves are connected in SLI.

Running multiple WoW accounts on the same PC. Cool stuff.

I don't understand this woudn't effect the game.

No i was not talking about effecting the game. Somewhere i read that you could not use 2 video cards in SLI and also use dual monitors in dual view mode with the NVidia software. Now it is altogether possible that either i misunderstood the article or that the information given was incorrect. If anyone has had experience running 2 monitors with dual video cards in SLI with each display showing something different( i usually have desktop on one display and a game on the other) i would appreciate a clarification on this matter because i would love nothing better than to have an excuse to dump this genuine intel mobo(D915PBL) and pick up an overclock friendly SLI board and a second video card. I am using an intel P4 775 3.4 GHz processor so any suggestions regarding a good, compatible, mid priced easily overclocked mobo would be greatly appreciated.
P4 775 3.4GHz
Asus 6600GT PCIe
2X512 DDR2 533

What would be the point of SLI with two monitors? Two gpu's with two monitors.... would make more sense to just plug one monitor into each video card and forget about the sli connector.

you would need a SLI compatible MB just to get the two pci-e x 16 slots though.

A dedicatd video card for each monitor would speed things up i'm sure.

No you definently can use two monitors to do different things at different times like play a game and type a report. I have seen this done.

Ok , so according to Waylander , there is no advantage gained by using SLI with 2 displays. Now the question is why , and i am sure im not the only one who doesnt realy understand the difference between using two video cards in SLI or independent of each other , so to speak.

Because if you use the cards seperate you get driver issues...
And if buying a sli motherboard get a full duplex 16X PCI-E otherwise it really has no use to put 2 cards in imo...