I had student loan than originated in 1997 and through this problem and that problem I ultimately defaulted on the loan. In 2008 and 2009 our taxes were offset and left a balance on 2 of the 3 loans for $74 and $42. I was told at the time that I wasn't eligible to rehab the loans because I didn't owe enough. My option was to pay it off and have the default paid for 7 years on my report. Since Feb 09 I just didn't take care of it, which normally would be bad thing, but today I decided to call and take care of it. I figured that I'd have the paid default for the next 7 years but was also planning on asking about getting it removed. Before I got to that point in the phone call I asked if there was anyway I could do the rehab...and the answer was yes!
I'm rehabing for 9 months at $5.00 and then paying the balance on April 2nd, 2013...at which point the loan will go from being a default to being a positive paid student loan

YAY!
I figured I'd add this in here for anyone else who thinks (or was told) that they didn't owe enough to rehab. The minimum payment they take is $5.00 and the minimum program time is 9 months, so as long as you owe $45.00 you should qualify.
I don't know how common this is, but finding this out today has been terrific, I hope this info helps someone else