Source: http://lifehacker.com/5626601/transfer-big-files-circumvents-iphone-upload-limits
Like many file transfer sites, Transfer Big Files uploads the file to their site and emails a download link to you or to whomever you're sending the file.
The app is pretty straightforward. Once you've signed up for an account, you just select the videos and/or photos you want to send, specify a recipient (it defaults to your email address), and send away. While I wouldn't say speed is it's forte, it's an effective means of getting those HD videos off of your iPhone without plugging in.