... bit late but... most (all?) of the responses offer 1/35th not 1/32nd scale pieces. Whilst in SF its not a case of 'it can't be right' because who knows, there is a crucial difference in human body scale involved and the pieces rarely mix easily. Even the lovely resin single figures advertised as 1/32nd often turn out to be 1/35th.
We (Skirmish Wargames) game in 54mm 1/32nd scale almost exclusively and are just looking at an SF setting (we already do it in 95mm 1/18th scale -http://s654.photobucket.com/albums/uu266/MikeBlake/Sci%20Fi/ ). The 2 1/2 inch Halo 3 sets are pretty much 1/32nd, and there are some Star Wars sets in the scale too.
Would love to hear of any more out there?