Can somebody please explain bitaddress.org? I see it generates addresses. Couldn't I just use their source to allow my webhost (heck, even a free one!) to generate an address whenever a user signs up, and save in a DB somewhere that bitcoin address and the private key? Then when I want to spend bitcoins, I just import the private keys into my local machine and POOF, tons of coins?

And also, one more thing, how do I import the private key into my wallet? Do I just copy it into wallets.dat? (My wallets.dat file is encrypted, so I doubt that would work).

Thanks!