Could be that it's a "Standard Legal Tactic" but those same lawyers are going to back in this same court once Obama in nominated so what have they really gained? I don't buy it. And neither would the Man on the Street if story ever managed to get to him. Which of course it won't.
Did you learn nothing at all from 2008? Delay, delay, delay. Run out the clock. By the time this is resolved, appealed, delayed, appealed, delayed again, etc., the election (and subsequent certification by Congress) will be over, and then the suits no longer have standing because it's Congress' job to enforce elections certifications, so it's no longer a court issue. (This is why all of the eligibility challenges to date have failed.)
More to the point, as long as Obama can get his name on the ballot and keep it there until election day, through stalling and delaying, it won't matter one whit what the finding of the court eventually turns out to be. That's why they're going to drag their feet and delay every step of the way.