No, the charger is proprietary. Generic chargers take forever to charge the thing, if you can find one that fits. Apple's do not.
I went out and bought me that Nook docking charger. It's costs enough ($40) + the cable (no it does not come with one - how dumb) for another $20 or so but it sure is worth it for me because the battery just goes down to fast if you do enough on it. I have it connected at work now and it's great. I never have to worry about it dying on the bus ride home. It also serves as a stand and connects to my external speaker as well.