There is no easy way about it thats for sure. Though I prefer brunettes to blonds, I do have a few blonds that I like.
I think Reese Witherspoon is GORGEOUS... I also remember a young Heather Graham. She looked amazing in License to Drive. My favorite blond today has to be Stacy Keibler.

Just drop dead beautiful.
Virginie Ledoyen is so sexy, but I've only seen her in "The Beach." I haven't seen anything else from her but I would definitely love to. She is so hot.
Jennifer Connelly in "Blood Diamond" was scorching hot!... Though she always is, she took it to another level in that movie.
On to my Latinas, well you've seen a few of them that I posted pictures of in this thread. Love Salma Hayek. First saw her back in 1995 in Desperado and have been a fan since. She's smokin..
Eva Longoria of course. Tony Parker doesn't know how lucky he is.
Eva Mendes as well, especially in Training Day.
A little Roselyn Sanchez as well.
Hottest black woman, now.. Too many. But we can look at Beyonce, Sanaa Lathan, Stacey Dash is still hot at her age, Halle Berry of course, and we can't forget the island beauty herself, Shakara. She's something else too.
Like you said, too many to name.