I encourage others who are affected by the Defense of Marriage Act to do the same. I figure it might help make more of an impact if they can see who they're hurting.
Note that on the White House official site, they explicitly ask that you NOT send "personal items such as family photographs" because they will only be chewed up during the security procedures. However, I don't think there's any reason they can object to an image printed directly onto the letter, which is what I did. All you have to do, if you have a digital copy of your photo, is insert it into your MSWord document (or whatever WP program you use) and then print it on a color printer.
Here's the physical address to which you can send your letter:
President Barack Obama
1600 Pennsylvania Avenue NW
Washington, DC 20500
My advice, FWIW, is to refrain from using inflammatory or hostile language and try to express your feelings more on the "saddened and disappointed" end of the spectrum. I figure that by writing a letter I am tacitly agreeing to at least pretend that someone in the WH might theoretically care about what I have to say, so that dictates to some extent the tone of the letter.
C ya,
The Plaid Adder