Also don't forget, if you happen to be in the market for a full suspension mtn bike( which your not, but I'm just sayin) they will need to know for the rear shock. They will either need to pump it up, or let out some pressure or whatever depending on your size.
I was a bit flustered when they asked me as they were setting up a mtn. bike for me to test ride. But then I realized WHY they needed to know. They didn't bat an eye when I told them my weight, but I was a bit self conscious.
And for the record I have weight issues (to say the least)...

The thing is, you just have to realize that most people really don't care. And like someone else said- we LOVE converts!! And if they DO snicker?? Well that is a personality flaw on THEIR part. Ignore the negative ones and embrace the positive!
Good luck in your bike search. ANd remember... We want PICS when you get her!!

HEY! I just realized this was your first post! WELCOME!!! Hope you stay awhile. We are quite a friendly bunch here!!