Maybe something over svn... I know a lot of linux users happen to use older desktops/laptops without dvd drives/burners or usb boot capability. Actually I've got one here I wouldn't mind setting up myself come to think of it.
Also this would be a one-shot answer to those on this forum having trouble with making the usb file into an iso. Then we can look forward to a whole new slew of messages asking about how to use svn .
-ps I just realized this pops into the bt2 features... my suggestion is in relation to bt3 development and final release.