I like it. Nice and clean though, I'm not too big a fan of "flat", it gets the job done without too much fluff. For a developer strapped for time, something simple to slap on the back (no pun intended) definitely works.

Tinsey nitpick in UI http://www.html5admin.com/demo/ui.html , spacing between the input fields in "Inline form" could help, but that's definitely an easy fix.