Here's a quick round-up of car seats people have mentioned in the discussion about what to car seat to get when your kid outgrows his infant carrier more quickly than you expected. Only a few seem to be useful for taxis, though:
Eddie Bauer Cosco 35 [usable from 5-35lbs, much-lamented, out of production]
Evenflo Triumph 5 [5-30lbs, rear-facing. cheap, highly rated, not hip]
Sit-n-Stroll [the carseat/stroller in SkyMall. Looks like a mini-La-Z-Boy]
"small cardboard box with blankets and padding...in the back seat of [a] '67 Dodge Dart" [note: DO NOT TRY THIS AT HOME. OR ON THE ROAD.]
Graco convertible [?]
Britax Decathlon ["has extra supprt for smaller infants and is super comfortable."]
Potentially taxi-friendly options:
Cosco Tote 'n Go Portable [looks like a little backpack w/a 5-pt harness. "really hard to install well"]
Cosco Touriva ["bigger than the infant seat, but a lot smaller than most convertibles out there." also good to 35lbs.]
Graco SafeSeat [coming soon, infant-30lbs, "basically a big SnugRide with a different base"]
Sunshine Kids Radian [also coming soon, it folds up. "pretty freaking heavy" but potentially "awesome for nyc parents." here's an earlier DT post on it.]
