She finally said it although it was in the TV cliché way of letting it slip out.
However it was still sweet, funny and touching.. i've been waiting for that for a long time. I was first worried that Leonard's idiot behaviour would break them apart.. he really was kinda a jerk about it and Penny was right calling him out on it.
However Leonard's cluelessness is totally believable to me as sad as that sounds.. i was like that once (though far younger than Leonard) but i also know guys who'd react the same way as Leonard because their self esteem is so low that they can't believe any woman would find them interesting (Leonard's assistant is cute btw).
The other plot was funny too.. some good old Raj/Howard teamup which was missing a bit since Howard got Bernadette and a big fuss over absolutely nothing