Hi Leslie, What exactly do you mean by 'labs'? Interactive? Our content partners may be of use for labs.
In the meantime, if you haven't found a great hosted 2.0 platform look at ours. The ManyOne Universal Portal Service (UPS) (publishing, collaborati... was designed to house the EarthPortal*
It (the UPS) is the only large scale fully-hosted Dublin Core standard publishing system for serious editorial/collaborative processes. Its free and easy for academics and kids alike :) We are just beginning to form communities around the EarthPortal pending the migration commencing shortly.
I know it sounds complicated. I'd love to chat if you are interested in learning more.