Actually, Bill Gross of PIMCO is buying AIG bonds--there was recent article in Barrons or WSJ about this--and he said they were essentially guaranteed, or he believed they were as good as guaranteed--but he may not be telling the whole story. If you check the FINRA listings of bonds on the market it's clear that AIG bonds are paying out at both extremely high rates (at the moment 20%), but also at lower rates (7 to 8%)--so some could be "guaranteed" in some form or other, and others will eventually get tossed on the junk pile. You'd have to be true professional to know.
If you want the benefit of Bill Gross's expertise you can buy his Pimco High Income Fund (PHK), which is currently returning about 15%. It's on slightly volatile side, so you'd want to check it on pretty regularly basis. It pays on monthly basis like REITS used to do.