I've heard that many folks just stuff their running shoes down their shorts, heel-first - one in front, one in back - for the swims.
Yeah - I thought it was pretty bizarre too.
I do think others use the method Keith mentions - it was certainly the first thing that came to my mind as well.
The qualification criteria for SOS are pretty strict.
(I've techncally qualified, but since we all know what a truly crappy swimmer I am (and that is WITH a wetsuit), I won't be attempting this race anytime soon.)
"Flailing?" "Flail on!"