Uneven/Unbalanced RAM-need advice

Hey Guys,
I’m getting a new C2D MBP. It comes with a single 1 gig stick of RAM. I have an additional 512 from my Core Duo MBP that totally pooped out. I can’t afford buying another 1 gig stick. My question for yall is what do you think of having unbalanced ram? I’m wondering if I should install my 512 in the second slot for an uneven 1.5 gigs or ram. I know this used to be a relatively huge issue, but I don’t know what the current state of affairs is. I tend to think its okay since the Max RAM on these machines is 3 gigs (a 2gig and a 1 gig stick) but dont have any hard evidence. Any thoughts will be much appreciated. Any formal tests that you know of?
-d

Think about it this way- it will be unbalanced if you don't put the 512 in (1024, 0) and it will be unbalanced if you do put the 512 in (1024, 512). I say put that sucker in. More RAM is more RAM. The dual channel isn't a huge deal anyway. It would be optimum to have matching sticks, but it's no big deal if you don't.

mine (1x1gb 1x256) says its running in Dual channel.

odd?

Trial and error is a great way to learn. so try it! if it runs great, if not just take it out.