The search button on the forums is white. It blends in with the background. @ The top right, the eyeglass. Plus that weird small white bar at the top of the forums where you integrated it into the site, might just be because of vB forums though.
You should add some rewrite rules to the .htaccess to permanently redirect links from the old URL structure. You have quite a few sites indexed by Google, it would be a pity if they all would be obsolete now. Right now all the links in Google and other search engines redirect to the main page.
Also fire up Firebug and load the frontpage. It bombs you with error messages, related to the news slider thingy. BTW, the slider flips images/news way too fast. 15 or 20 seconds should be fast enough.
When i click on the full screen button in the UStream live stream nothing happens, but this button disappears.
The URLs could be optimized for search engines, simply by adding the title of the news/article after the news ID.