[CazicT]

Well shortness isn't much of an issue if deciding to call an all-in bet on the river unless you think he is more apt to act a certain way when short. Do you think he is more apt to bluff all his chips or less apt. To me, he is probably slightly less apt to be bluffing here given that we have no reads, but since this is small stakes online, maybe i'm off base.

What hands could he be betting for value that we can beat?
JJ-KK (wouldn't he have raised initially preflop?)
A9, AT (Possible, the preflop call of the hero's raise would have dubious though I would think)

What hands could he be betting for value that we can't beat?
66,99,TT (66 seems likely, TT probably would have been raised initially preflop (we are 6 handed) but it isn't 100% certain. 99 isn't that likely, but not impossible)
89

Then there is the possibility of a bluff.

I guess given that the competition at this level isn't necassarily the greatest, there is decent chance you are good on the river, so given your 3 to 1 odds, maybe a call is OK. For some reason though I just get the feeling he has either 66 or 89.