I think that the birth certificate is significant and should pursued. BUT - think about this - if Beck and others prove that Obama is not eligible to be President, what happens? We get Joe Biden and it's business as usual. The commie thugs are still running the show. And of course, if it turns out that Obama is shown to be eligible, we've wasted a lot of time and effort to gain nothing. Plus, Beck takes a hit and we lose an effective mouthpiece.
I think he's far more effective doing what he's doing - exposing the democrat party as the criminal, communist empire that it is. Methodically, taking down one or two at a time, he's effectively linking the underworld with those that are trying to lead this country in the wrong direction. He's exposing the whole gang of thugs, instead of just one. Pelosi, Reid, Franks, Dodd, Obama - and many others are implicated in Beck's works. If he misses on one or two, he's still got credibility because he's already got a few victories under his belt.
Let others pursue the birth certificate issue in the background. Let Beck continue to work at systematically destroying the democrat mafia machine. He's very effective at that.