Hey Peter, this is an apt topic for me right now because I'm finally doing just that!!
I have started filing my SKMs that I use most on Dropbox under a Resource folder so I can access them from home or work; also for my work colleague so we always have the latest set of materials [thinking about a core library or components as well but just need to make sure they're clean and not too big file size....
A SKM viewer would be good, actually a SKP viewer would be nice too; I'm using a 64bit machine!! π
And yes, I have cleaned out the standard range of roof tiles, sketchy materials, etc that came with SU3....
π