No, you definitely require both chambers of the General Assembly in Pennsylvania. Jubelirer of Vieth v Jubelirer fame (the SCOTUS case on the PA gerrymander) was a state senator BTW.
Minnesota, Wisconsin, and Oregon also require both chambers to approve a congressional redistricting. Oh, and to reiterate, Governor Pawlenty of Minnesota is still a Republican, and must sign off on any redistricting, and there is no chance the Oregon Dems could redistrict their lone Republican congress critter, Greg Walden (OR-04), out of office.
Correction: Greg Walden is OR-02, not OR-04, which is DeFazio. And, speaking of DeFazio, that is actually a toss up district (49.1% Bush in '04 v 49.4% Kerry) and Hooley's OR-05 is too (50.1% Bush in '04 v 48.8% Kerry) so it's not as if the Oregon Dems have much leeway to play. The OR-01 seat too is only 54% Dem.
Isn't it amazing how the election results this year changed the redistricting potential in exactly zero states, as far as I can tell?