Congratulations to the Octopart team for the fantastic work! For those wanting to try out javascriptMVC3.0 here's where you can get it: http://github.com/pinhook/framework
Some things would be improved with more attention to accessibility. Ext.tree.TreePanel, for instance, allows keyboard navigation out of the box. In a similar vein, the results grid doesn't allow row selection/keyboard navigation (ref. Ext.grid.RowSelectionModel).
JMVC doesn't provide packaged widgets (though it is starting to). It's about providing a middle layer (above jQuery, less than customizable widgets) to build customized apps that are as light as possible.
