YouTube announced today that they have seen an increase of 1700% in mobile uploads over the last 6 months.  They also acknowledge that the iPhone 3GS has increased mobile uploads by 400% A DAY! Here are some quotes from the article:

“This growth represents three things coming together: new video-enabled phones on the market, improvements to the upload flow when you post a video to YouTube from your phone, and a new feature on YouTube that allows your videos to be quickly and effortlessly shared through your social networks. It takes just a minute to connect your YouTube account to your Facebook, Twitter and Google Reader accounts.”

So while the new iPhone and the easy YouTube integration has certainly helped with the increase, social networks have also helped spur the growth.

[YouTube Blog]