iPhone 3.1 have recently released Beta 3 Video allowing you to copy/paste your videos.
Like copy/paste for images in iPhone 3.0 it allows you to send copies of your videos without the compression that goes along with the share function. Pick a video, tap and hold for “copy”, switch to email, tap and hold for paste.
The size of the email boxes for the sender and receiver will still likely be a limiting factor. YouTube have posted up a video showing the new copy/paste functionality take a look below.
Source – theiphoneblog