i like this free one a bit -
stock.xchng - the leading free stock photography site
havent read the fine print but on the front page it says
Browse through the categories of our huge gallery containing over 350.000 quality stock photos by more than 30.000 photographers! Need a wallpaper for your desktop or illustration for your blog? Need a pic for your commercial website design? Looking for inspiration? Have a look around.
i thought the photots were generally pretty good for the most part - i know you could prob get better with a pay for site
is it my imagination or used there be a serious photography site around called corbian or something like that ?? couldnt find it on google though