I cannot express it enough...
GET MMS for the iPhone!
I absolutely hate looking up pictures via viewmymessage.com ... the site runs extremely slow and the image is shrunk so small from the original you can barely make anything out. And the ever-changing login ID is chaotic at best. Why not just use your phone number as the ID? Having to try to view your image using your iPhone versus a computer is even worse, especially since you can't copy paste. So you go back and forth back and forth trying to enter in the right ID and password so you can view an image that should of just been there via MMS.
My network of friends often send between 2-10 pictures and videos a day via their phones! Too bad I can't play like they do. Oh well, only person I can blame is me for getting an iPhone. Such lovely technology with such simple limitations!
On the upside... I'm really hoping that SDK will allow us to send pictures via text messaging. I've heard that it may not happen, but I've also heard that it might!
In the meantime I like to send complaints to here as much as possible:
http://www.apple.com/feedback/iphone.html