Denis Demidov

May be something similar to what readthedocs.org does? They have a small floating button in the bottom right corner which you can use to select version of the documentation. See...

http://www.lego.com/en-us/mindstorms/build-a-robot

Maybe 'Community showcase' instead of 'creations'?

Featured projects? Community projects? Robot gallery? Community robots?

Include the link into new kernel/release announcements?

This sounds like a badly conditioned matrix, which could mean you do need the double precision. Do you get nans both with CPU1 and CPU2? In case the solution fails...