Secret agent anime
 

Hi, I'm looking for anime where the main character(s) are secret agents of some kind, saving the world and all that kind of thing. They can be secret agents for the government (of any country), or for a secret organization, or something like that. Something like ROD the OVA (or ROD TV, I guess, but that wasn't as good). They can have special powers, or not, it doesn't matter. Oh, and I'd like as little fanservice and stuff as possible--not my thing.
Here's a list of anime I've seen already.
Any suggestions would be helpful. Thanks so much! ^_^

Here's a few off the top of my head:

Najica Blitz Tactics - two young women fight evil with guns and panties
Senkou no Night Raid - superpowered Japanese agents in pre-WW2 China
Noir, Madlax - two of the "girls-with-guns" trilogy from Bee Train; can't speak to whether the third show, El Cazador de la Bruja also applies
009-1 - female agent with a dangerous body

I'm not sure I'd call Monster a "secret-agent" show, but it has some similar types of themes. There's also Yakushiji Ryoko, about the female head of the supposed "Supernatural Division" of the Tokyo Police. The OP for this show is very reminiscent of Maurice Binder's titles for the Bond movies.

well Darker than Black is the best choice and it has two seasons :D