OK- new helmet it is. I thought I should, but wanted to hear from others (aside from the LBS guy who'd just want to sell me one anyway).
The one I was wearing today was a freebie that I won at Bike to Work Day- so it's not like I'm out any money.

Thanks, ladies! Like all the rest of you that have crashed at one time or another- I'm just really thankful that it wasn't bad, and that all my bones are still in tact (and who said big thighs are bad?- all that padding saved my hips from damage ).