I've updated HappyHour (a google gears enabled container for testing gadgets locally) with partial 0.7support using the latest reference scripts from Apache's Shindig project.
http://code.google.com/p/happyhour/ (downloads available)
You can see OSChecker running here:
http://www.igngadgets.com/gadgets/happyhour/Index.html?uri=oschecker.local.xml
I hope you find HappyHour useful -- it's made offline development easy for me. All the credit goes to Chandra for the initial .5/.6 plumbing.
Please provide feedback bclaridge@gmail.com