It's all very interesting really. The apps are all variations on a theme.
For example...Discover is cool for me as it is webDav and I didn't have to activate wireless on my iMac...just to have the iPhone running on the wireless network in my flat. Briefcase Lite required I activate remote login, which I wasn't keen on.
That said, I'm using none of these at the moment. Still using a Flash drive or (if it's a small file) dropbox (
www.getdropbox.com/) which has an iPhone interface you can use. I'm sure they'll bring out an iPhone app.
Phil