Yep, almost all of the sites I've seen (with the exception of US gov't sites, of course) that keep track of casualties lean left. Their agenda's clear. It's especially noticable when you look at sites that claim to keep track of civilian casualties.
It seems like there would be some accurate counts being kept. Some sort of census or something. We talk about such statistics concerning other wars. Trying to weed through the left wing idealogues on the web makes it tricky though.