The jMaki team has been hard at work re-working jMaki into the .9.x series which now supports all of the intended 1.0 features. At JavaOne we plan to offer a release candidate. If you don't want to wait you can try out the samples from the download page. We only plan on fixing issues so you can use what is there today.
JavaOne Sessions and BOFs
TS-9516 Using jMaki in a Visual Development...
