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SLI s worth it when playing games with very high IQ where you want resulotions at 1680x1050 and above with af and aa applied.
For SLI you need a SLI motherboard ( with nvidia sli chipset ) that has support for 2x full x16 PCI-E lanes, obviously if you bought one of these boards today you would want PCI-E 2.0 since thats what the new cards are based on ( dubbles the bandwith on the lanes basically, both up and down ).
SLI is worth it if you have a system that can carry it, as in 1680+ resultions, 3 GHZ + c2d/quad ( can easily OC say a Q6600 from 2.4 fhz to 3.6 ghz @ stock cooling with 780i nvidia boards ).
Old games scale bad for SLI, new games scale better, some games scale very good. Then again alot of the semi old games where tested on SLI rigs wich did not have full x16 PCI-E wich obivously bottlenecks the 2nd card alot.
2x 8800 GTX in sli > 1x 9800 GX2, 2x 8800 GTX > 2x 9800 GTX in SLI at the high resolutions and maxed aa/af ( wich is the only reason to actually GO SLI ).
9800 GTX vs 8800 GTS is a toss up, 9800 GTX is slightly faster at very high resolutions and aa/af applied where the 8800 GTS is slightly faster at lower resolutions and also slightly less costly.
P.S If you have a SLI board then getting 2x 8800 GTS's could be a nice solution, cheap and alot of performance vs cost.
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