Speaking of marches, the big one that is being planned for 2009 is the National Equality March scheduled for October 10-11, 2009 in Washington D.C.
From the website:
On October 10-11, 2009, we will gather in Washington DC from all across America to let our elected leaders know that now is the time for full equal rights for LGBT people. We will gather. We will march. And we will leave energized and empowered to do the work that needs to be done in every community across the nation.