This is an old thread, and I'm actually working in SSIS (now Visual Studio) 2012 - but I would say this last method (rearranging the order in the code - you can do this within SSIS of course by choosing the "code" view - and of course would backup the package before messing with it like this) is by far the least cumbersome, if it's just rearranging work.

It seems ridiculous that there's not an in-built way of doing this (move column up...), but there you go