Actually, I found a way to upload a picture to TwitPic.com instead of to UberTwitter even if you have UberTwitter.
If you go to TwitPic.com and click Setting, it will give/show you your unique email address that you can use. All you have to do to upload your phone picture to twitpic is
1) select the picture you want to upload
2) select the option "send as email"
3) send it to your unique twitpic email address
4) to add message to your twitpic, you need to edit the "Subject" of your email and it will show up as your caption.
hope this helps!
this is what i'm going to do from now on. UberTwitter is too good to ditch!
friends hate me cause i'm always on my blackberry...