More genocide

Commenter mattbastard at ObiWings succinctly puts the practical importance of the House bill in focus.

http://obsidianwings.blogs.com/obsidian_wings/2007/10/why-armenia.html
Adding to what Nell said, nations that officially recognize the genocide adds to pressure on the the Turkish gov't to reform its longstanding official policy of denial. Considering Turkish citizens can still be arrested (or killed) for even mentioning the atrocities of 1915, I'd say the concern is more immediate than you think.
(JFTR, Canada passed a similar resolution in 2006.)

I had completely forgotten that in Turkey it is actually a crime to even debate what happened in 1915. I remember a few years ago reading a news story about a Turkish bookseller who was killed for carrying a book that used the term genocide. As I said before I personally find it bizarre the way Turkey refuses to acknowledge what happened - going so far as to threaten to break off ties with Israel unless the Jewish diaspora join them in denouncing the House resolution - but you can be sure if Germany or Rwanda tried to deny what happened in their country people would not be saying we have to respect them and not rock the boat.