Octopart Part Browser, built with JavascriptMVC

This looks very promising. Great work!

It'd be a little more interesting if the source wasn't obfuscated or provided in full elsewhere.

Its very neat and simple. I think its going to be a winner.

Needs filters to be useful but otherwise very cool.

The back button works! Hallelujah!

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).