(Wow, two posts in one day?!?)
I just noticed something that Thunderbird does (or doesn't do, depending on your perspective) in version 2.0.0.5 that has bugged me about most every email client (MUA) out there.
When you reply to something out of your sent items, it actually realizes that you are in your sent items and populates the original recipient in the To field instead of putting the sender (i.e. you) in the To field.
Thank you for fixing this, now if everyone else would follow suit....
