Yeah, watch out! I started at the end of last year, and finished one pair. Determinedly decided not to fall prey to "Second Sock Syndrome," I immediately cast on for the second sock.
within a few weeks I was working on my second pair... and I began to see the problem with that second sock. But I pushed through.
Yesterday, I had my first class on knitting two socks on two circulars! I'm really excited about this, and have about 2 1/2 inches done on BOTH socks! Whoo-hoo!
Yeah, it's a little addicting.