Steam's been downloading all this crap onto my computer for weeks and now I find out I can't do anything with it because I don't have a credit card. Hey Valve, ever hear of Paypal? Time to beg the girlfriend to buy it for me, I guess.
That said, I'm interested in CS:Source, but I actually just started playing Counter-Strike a few weeks ago for the first time so I don't really care too much. I don't forsee regular CS becoming boring for me for quite awhile - unless CS:Source adds a lot more than just prettier graphics to the game I'll probably avoid it.