In reply to David Barratt:
with the latest batch of gopro's you can use the built in wireless and your smart phone to view / frame your shots as well as the addon lcd bacpac
that said battery life is not stupendous on most action cameras, but batteries are cheap
if you decide gopro might be your thing head over to
http://goprouser.freeforums.org/
for lots of good advice (be warned though like all things there are a lot of people on their just moaning about their cameras, these things are used by thousands of people but you only hear about people complaining... that said it's useful to know they aren't perfect before you buy