Unless your video is very short you're going to find that all videos are way too large to e-mail. Most mails cap at a few megabytes and videos can be hundreds of megs.
Your best bet would be to upload those videos from your iPad or sync then off, then use your desktop to upload it to a service like youtube or other online sharing service. (On youtube you can designate videos to be 'unlisted' so that only those with links can see them if there's a need)
You can also look into things like dropbox where you upload it off your iPad then download into your computer or share the raw footage with your friends that way.