For those of you who are still on the first-gen iPad like I am and are looking to upgrade, a quick note here. eBay is offer a trade-in for cash. Not a bad deal if you're looking to upgrade to the 2012 iPad.
As you can see, for my 32 GB iPad, I'm able to get $215. Not a bad value. Not great either. At the end of the day, I'm still very fond of my iPad so I think I'll be keeping it. I don't know if I'll be upgrading to the 2012 iPad yet. I might after I've seen the awesome Retina Display and feel the speed of Apple's latest magical tablet.
But if you're up for it, eBay is willing to pay you for your older gear.
Note: Even if I decide to get the new iPad, I'm not letting this one go. It's like the original Mac, an antique.