Is she going to tempt him to uncurl with a second spoon and a 'Batman' dvd? I just get the impression that she is watching something, and that Sheldon's interest has just been caught, he's on the verge of rolling over to watch, too.

Yeah, that's pretty much what I imagined, especially Sheldon being on the verge of rolling over, maybe to respond to what Penny is saying. I did contemplate drawing Penny offering Sheldon a spoonful, not that he would take it, of course (germs and all), but... Yes. I like the idea that's Penny's catching up on the geeky info. :)

I mentioned in my tutorial that I imagine my drawings as scenes playing out, and I just try to capture a single moment from that. I didn't conceive that Penny would be watching anything, but that does fit with how I've drawn her eye line.