In a relatively quiet move, Flickr recently added Twitter integration to their service – enter Flickr2Twitter. Using the service, Flickr users can now easily “blog” their existing photo to Twitter with one click or they can send their photos directly to flickr and Twitter in one move from their mobile or via email. Flickr2Twitter Beta can be found at http://www.flickr.com/groups/flickrtwitterbeta
In order to use the service, Flickr users will first need to provide the proper authorization and give Twitter access to your account- see www.flickr.com/account/blogs/add/twitter
Then, to easily start flick/Twitter posting from your mobile simply post to your unique email+Twitter address. Then, when you upload via email, the subject line will be taken as your Twitter tweet, and a special Flickr-y short URL to the photo will be appended. For an example see photo here http://twitter.com/gletham/status/2431210430
A sample photo sent to Twitter from Flickr using the “Blog” this function
The same photo in Flickr – notice the “blog” option