I'd like to know how many moderators are there on Stack Overflow?
- Are they available 24 x 7?
- May I know the moderators names (if possible)?
The diamond moderators list is available on the About Page of every site. A complete list is available on the Meta Users Page.
Alternatively you can e-mail them on firstname.lastname@example.org or you can post a question here and one of the moderators here will try and assist.
Excluding Jeff and the development team there are currently (February 2010) 4 SO moderators, 3 SF moderators, 4 SU moderators (all of which can moderate Meta) and 4 Meta-only moderators.
User above 3K and 10K reputation on every site are also considered moderators. They have the ability to close questions, view flags and view deleted posts (10K). They do not have access to user information.
You can find the moderators on each site's user's page on their own tab:
Also, all of the moderators at the above sites are moderators here at meta: