php / mysql style documentation system

[sdani]

I am looking for my own documentation system similar to these

[us2.php.net...]
[dev.mysql.com...]

They both have something in common - i.e. the end user can add comments.

Any recommendations on some similar documentation systems?

Thanks
sdani

[whoisgregg]

Any blog software has this capability.

[sdani]

good point - thanks whoisgregg