Is it just me, or does Penny and Leonard have the romantic chemistry of the cartoon Pepe Le Pew going after a cat. http://www.youtube.com/watc…

Penny going from a waitress/actress to a professional, including a new haircut, wasn't totally out of character? The whole show was Penny being outside the nerd/professional world.

The "joke" about how Wolowitz thought that Leonard wanted a wife swap sex thing went over the line and kind of killed the mood for the program, and kind of killed the relationship to relationship thing. In the real world, that would have been a big elephant for years.