I have a hard time believing (at least at this point) that Penny/Sheldon will ever become canon, mostly because TBBT doesn't subvert sitcom tropes the same way HIMYM does. I do like Leonard, but like you said - he and Penny just don't have the sparks.

Hooray for friending - I'm definitely adding you back! Right now I'm gearing up to write the ship_manifesto essay for Barney/Robin, so I'm in need of people to flail about brOTP with me. Obsession is a good thing. ;)