Apps can now be distributed directly to beta testers devices by having them simply go to a URL in Safari. This would save beta testers tons of time and would help people who couldn't access a computer with iTunes. Sorry if this has already been posted. More details here: http://www.paradeofrain.com/2010/11/taking-the-pain-out-of-ad-hoc-testing/
I've already tried it before, and it makes everything simple compared to downloading files, dragging it onto itunes, syncing... ITS JUST TO MUCH WORK! This way is much easier. I hope developers start doing it that way.
since i can't link to the original post.. here my 2cents about testflight the most important part of distribution is already build into xcode.. xcode is building the ipa with the adhoc profiles embedded into it so 95% is already done by the developer.. so if you have webspace you don't need to sign to a 3rd party service.