Win7 RAM upgrade help/questions - Help?

I am upgrading my PC for the upcoming Windows 7 release.

Currently, I have two, 1 gig sticks of this ram - http://www.newegg.com/Product/Prod [...] 6820220144

My motherboard is the P5B Deluxe Wifi AP. http://www.newegg.com/Product/Prod [...] 6813131028

I would like to upgrade with this RAM - http://www.newegg.com/Product/Prod [...] 6820145184

Now - my question is, do I simply just replace the old ram to make 4 gigs? Or do I just put the new ram in the yellow slots (where old ram was) - and put the old ram in the black slots to create a total of 6 gigs?

Just add the new ram, but make sure it's the same speed brand as the 2 1gb sticks, for 6gb total goodness, this is the memory you want, enjoy.
http://www.newegg.com/Product/Prod [...] 6820220269

No that just keeps it dual channel, the memory sizes have to go in corresponding slots, i.e the 2 2gb in one color and the 2 1gb in one color, so you can just add the 2 2gb to the empty slots.

Yeah, i got 4gb of 1066 back in the summer for 45 bucks, a year and a half before that i payed 200 dollars for 2gb ddr 800, so it's not to bad, and worth the investment, im running 8gb, and it's nice.