In other words, do exactly what the Dems did in 2006 and 2008. Hey, it worked.
The Dems are getting caught in a vise between a lack of courage of convictions and the GOP pretending it's still in power. If the first 8 months taught the Dems anything it's that there is no possibility for bipartisanship (the GOP feels they would be foolish to grant the Dems any legitimacy at all when their rhetoric to their base is This is the End Times!). The next 8 months ought to be about laying the groundwork for the midterms by forcing every vote to the floor and getting all the Republicans and the handful of Blue Dogs on record for all their nay votes. 2010 will then be about who "did nothing." If the country sees where the Dems are trying to go as worse than going nowhere, then the Dems will lose strength. If the country sees the GOP and the Blue Dogs as sabotaging the 2008 election results by stonewalling, then they'll be punished.
The most serious mistake the Dems can make is continuing to parlay and allowing their opponents to have it both ways. Make them defend the status quo by voting to continue it -- force them on record. Then we'll have a real contrast rather than a game of Beltway BS. My guess is if the Dems put it in stark terms, the GOP will overplay their hand wildly by continuing to encourage the screamers, the deathers, the birthers, etc, and Obama will come off looking like Mr. Smith trying to reform Washington but being plowed under by the Machine.