They had an OS/2 category there (computer->Operating_Systems->OS/2) .and they need and editor, it's not a job or something paid of what I had seen.
This is what it says:
" As the web grows, automated search engines and directories with small editorial staffs will be unable to cope with the volume of sites.
The Open Directory Project's goal is to produce the most comprehensive directory of the web by relying on a vast army of volunteer editors. The Open Directory Project is an online community. Thus, it is important to have the ability to work well with other editors, in addition to having a critical eye for organization.
The goal of editors should be to produce useful resources for the web public. We do not bar editors with business affiliations, since those editors with their own sites usually know their competition and related sites better than anyone. This knowledge can be ideal for helping build an authoritative directory. However, we will not tolerate editors who only add their own sites, or maliciously interfere with others' listings in the directory."
-> URL: http://dmoz.org/Computers/Software/Operating_Systems/OS2/
Source: