Jennifer Lawrence
A true grade-A beauty.
Jennifer Aniston. As a 40-something I think she still has more in the looks department than Zooey Deschanel (who is definitely a close second IMHO). I guess I just like eyes.
I tried to be open minded and come up with a good looking dude, but I really can’t. I keep coming back around to guys who look used up, like Woody Harrelson, or Liam Neeson.
I’m totally sexist, I guess. Pretty actresses are ‘attractive’, but ‘attractive’ actors are those who’ve put up strong (but realistic–sorry Stalone & Arnold!) character roles.
When Elizabeth Henstridge smiles it’s stunning.
Right now I would say Molly Quinn (Castle), or Jane Levy (Suburgatory). Or Karen Gillan. Maybe Amy Adams.
Yes I have a type. But I am open to other possibilities.
As for guys I’m totally tone deaf about have attractive they are. One of the few that made me realize how good looking he is would be Henry Cavill.
Megan Fox sans tattoos
Michael Fassbender
April Bowlby who played Kandi on Two and A Half Men as a Gracie Allen ditz. She stole every scene she was in. I also understand she had her own show, Drop Dead Diva, but I never saw it.
As for men, gotta go with the true competition: Carl Reiner.
When Elizabeth Henstridge smiles it’s stunning.
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Ming-Na Wen is stunning even when she just looks vaguely pissed off.
From watching Brooklyn Nine Nine I’ve developed a thing for Chelsea Peretti and Stephanie Beatriz. . . fairly unconventional great looks and funny and tough.
Men. . . I think I gotta go with Timothy Olyphant.
I have to go with Scarlet Johansson. Meaghan Good is pretty stunning as well. Kat Dennings also. Yes, I am having trouble making up my mind.
Christina Hendricks - even if the competition was from the neck up.
I don’t know about the dudes. I can’t think of many that give the actors from the past, like Paul Newman, much competition.
Another vote for Scarlett Johansson. Even as a straight woman I think she’s smokin’.
David Tennant for the win. Ladies, if you don’t know who he is, look him up. 
Which is good for her because that’s the required expression for her character. Personal preference but I would put her third on that show. But I would love to have to make that choice.
Jessica Alba? Kate Beckinsale? Halle Berry? Rose Byrne? Jennifer Connelly? Rosario Dawson? Megan Fox? Heather Graham? Keira Knightley? Eva Mendes? Olivia Munn? Maggie Q? Amanda Seyfried? Olivia Wilde?
Don’t force me to choose.
I’d have picked Melissa Fumero ahead of either of them.
And, of course, Dirk Blocker and Joel McKinnon Miller for the slash pairing.
Speaking as a straight guy…
Stana Katic, who plays Kate Beckett on Castle. There are moments in that show where she just takes my breath away. Honorable mentions to Kari Byron and Kate Beckinsale.
As far as male actors go: Hugh Jackman. He just could get me to play for the other team. 
Rashida Jones.
I was just going to post her. Your link appears broken, try this one.
Thanks for the fixed link. Her profile photo in IMDB was the one I was trying to post.
I’m still trying to find a good picture of her in the black dress she wore at the end of Castle’s 100th episode, “The Lives of Others”. Man, she was stunning in it.
What, no votes for Nicole Kidman? Then how about Rebecca Hall? or Sienna Guillory?
Found a good one:
http://fashiononcastle.blog.com/files/2012/02/dress-luke-2.jpg
Fantastic choice. She’s #2 on my list. I have to go with Zooey Deschanel for #1.