From opengov.ideascale.com:

On January 21st, the President issued the Memorandum on Transparency and Open Government, calling for an unprecedented level of openness in government. In the memorandum, the President outlined three principles for promoting a transparent and open government: transparency, participation, and collaboration. Now, the President is calling on you to help shape how that commitment is fulfilled. This online brainstorming session, open from May 21st to 28th, 2009, will enable the White House to hear your most important ideas relating to open government.

Visitors can vote on their favorite ideas. The problem is that, like with every other similar effort the Obama administration has conducted, the most popular ideas are not always the best ideas; see the popular voting systems summary. However, there are less than four hundred items submitted so far, so finding good ideas isn't as difficult as it was with those other efforts. And, as could be expected, the potheads are out and about, although better ideas (relatively speaking) are currently far ahead of their loopy plans.