Wiki suggestions?

Learned ones,.

I'm looking for a Wiki to setup for the company to make available to
contractors semi-private documents

I don't mind if I have to pay a little for it, but open source would
be most excellent.

So, I'm looking for suggestions for some form of Wiki.

I'd like

1) Secure - two levels of access (view/edit)
2) Lightweight
3) Linux (obviously, 'cause f**k paying Microsoft tax where I don't have to)

It'd be nice if I could integrate it with AD (or at least LDAP query
for usernames/passwords), but that's not critical.

It'd also be nice if I could put some kind of skin or theme on it
customised by the marketing nazi's to make it look all company-ie.

Any suggestions?


Thanks.

DaZZa
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