--To answer you're other question about, what the points are for, I am new to it as well but I think I may have it down Barney style. There can be different sized swaps...Like One Tiny Stuffie? It's a small swap, all you need to send is one small handmade stuffie. You can do more if you would like to, that's between you and your partner. Then there are medium ones, same idea, I was told medium things cost like 10-15 dollars of cash value or 1-2 hours of crafting time...I think Large swaps, like the Christmas stocking one currently going on, those are ones you go all out on. To me it seems people join one large one, maybe a medium, and then do a few small ones like ATC swaps as fillers.
I hope that helped!
Here's a link to the point system: http://www.craftster.org/forum/index.php?topic=229624.msg3712343#msg3712343
Some swaps that don't use the point system have other size guidelines, like one tiny thing, or an ATC, or fill a flat rate box or an envelope, etc.