twitpic.com Started early 2008, by Noah Everett, Tulsa OK
TwitPic lets you share photos on Twitter. It is an online service that also allows you to post pictures from your phone, their api or thru the site itself. There are also other Twitter clients that have support for Twitpic.
Here is an example of a photo that I have posted on my Twitter account: http://twitpic.com/8x6e