The folks at SeatGURU.com track individual seats and rows on all the major planes flown by the top US airlines, noting which ones are particularly attractive (reclining, foot space, pitch space to the next seatback, overhead bin space) and which should be avoided.
The biggest problem I see here is actually getting the seat you want. Seats seem to be regularly reassigned at check-in, for example, and sometimes after that (during the increasingly frequent plane reassignments). Still, if you can work it out, there’s some useful info here.
(via BoingBoing)