I like it, nice clean design. I have only one big criticism:
I don't see the point of the sections "Recent Datasheet Downloads", "Popular Datasheet Downloads", etc, on the index page. I can't see anyone sitting there, looking tough all that, unless the individual happens to be a google bot, or something. It's redundant clutter, I'm sure most people would hit the search bar straight away. You're probably better off with clean index page with the search bar smack in the middle.