Ok... I've joined way more groups than I thought I would.
Right now, the groups on the side of My Page show up with the first groups I joined at the bottom and the most recent at the top. But I'd like to be able to put the groups I use the most at the top of the list (mostly the first ones I joined) so that I can get to them more quickly. (Heaven forbid I have to click to the My Groups page first... horrors!)