I know it's been a long time, but I FINALLY got around to releasing a new version of FlexBox!
This version features client-side JSON filtering (used in all the examples now), in addition to remote data support via ajax.
I fixed a ton of bugs, enhanced and cleaned up the documentation, and tested it in FF, IE, Chrome, and Safari.
Thanks for your patience, and please keep the suggestions coming!
Fairway Technologies, Inc.