Andreas--You exist just to give me great answers to my travel questions, don't you? :-) Thank you again!
Tom--I've heard of the single use numbers, but I haven't really investigated it much. I do have a BofA card, though, so I guess I should find out how to go about it!
Now as for the email security questions:
Frank--First of all, email predates the Internet. Second, email is not a secure method of digital transmission. Period.
Mike--How did I "decide" email isn't secure? The same way I "decide" grass is green? It's just a fact. Email is only secure if you're using some sort of method of encryption. And while I have a GPG key, I'm still pretty new to actually using it and feel better about good ol' https forms.
I really hope other people don't find you guys saying that email is secure and assume it's safe to send things like credit card numbers and passwords through it unencrypted.