I have a white Macbook from July 07 that still runs, and I use it heavily. I will admit, though, that I have had so many problems with the hard drive. The first time I had to replace it was March 08, but I couldn't do anything until May, so I was without a computer for 2 months. The next time I had to replace it was November 09. It should have cost me over $300 to do, but the guy at the Apple store decided against that and everything got done for free, including an upgrade to Snow Leopard from Tiger.
Ever since then, I'm sad to report I have had almost daily problems with programs crashing, running super slow, and my laptop crashing and then booting up again on its own. I just restarted my laptop about an hour ago and even that is no longer helping it to speed up. I can only hope and pray this thing keeps running for several more years, as student loans are a nightmare and if I lose my MacBook, I will no longer have reliable computer access (my mom's laptop and desktop do NOT count, as they are not reliable and they are not mine, plus they run the nightmare that is Windows Vista, which even my mom despises).
My recommendation? Make sure that the hard drive in it works well. If I was in a better financial position (re: one that would allow me to get a MacBook Pro), I'd offer to sell you mine at a really nice price to compensate for the stupidity of the hard drive.