I've still got about $35,000 to go from my original $60,000+ I graduated with, but for the last 2 years I've been paying an extra $150/month and I'm ahead by about 12 months on one loan and a few months on the other. I hope to be free too in a few years.
You should get a form in the mail every year telling you how much interest you paid, and yes, there is a credit you should be filling out on your return for it. It's nothing huge, though. I think we got about $400 back this year for it (out of the thousands paid in interest).