Thanks for checking out the page, I appreciate the comment! The nature of the project and the kind of coverage we've been getting is making people (understandably) wary, so I relish the chance to tell people more and show what we've actually doing.
To get your own sensors on there, we're running a competition right now sponsored by Discover Magazine where anyone can suggest ideas for sensors to add to the satellite and what they would do with it if we flew it - if they pick your idea we'd put it up there for free, and Discover buys the person who submitted the idea with a development kit/functional copy of the payload (our $1500 pledge level). I don't want to spam the thread, but the full contest rules are here and can give you more details: www.tinyurl.com/DSCRulesv2
Re: pointing - The sensors and camera can be pointed in any direction, the whole satellite reorients itself using magnetotorquers.
Re: schools - We're trying to chase down a number of schools to see if they want to run low-cost experiments, and I'd really like to see if any university wants to add a hosted payload - depending on what they want to do I think we could probably give them help for pretty cheap.
Re: Radhard - The satellite body gives a little radiation shielding, enough for the Arduinos to survive long enough for the mission (we're aiming for 18 months). The single-event problems we're mitigating by running code on a number of redundant processors simultaneously to filter out random errors, and the mission-critical systems and main computer are all running using rad-hardened components with space heritage.