For the first time in its nearly three-year history, the Health 2.0 Conference convened in Washington, D.C., this week. Previous conferences have been held in California, Florida, Massachusetts and Europe, but organizers weren’t sure Washington was ready for the Health 2.0 movement. That’s clearly changed. With the 2009 federal stimulus package’s hefty investment in health IT and the new health reform law, it’s clear the tide’s changing.