I haven't really watched Noir... but I know that it's about a female assassin pair who call themselves Noir. One of the members is Kirika, who lost her memory, that is, all except how to kill people (really fast). She teams up with another woman, Merielle (or however you spell it), and they accept jobs to assassinate people. The group Noir actually existed years ago and was also a pair of female assassins. It turns out that Kirika was part of the old Noir before she lost her memory. Eh... that's all I know...

Hmmm.. a good Noir site is so hard to find...

This anime series is complete with 26 episodes.