Good questions Wyvern :)

The most important skill is to be able to work and communicate with members in a respectful and helpful manner :)

HTML knowledge is useful as the coordinators will be helping to setup the form backrooms and co-manage contest.

Coordinators will be asked to monitor their galleries for TOS violations, and work in their forums to help answer member's questions, as well as work with the moderators to keep any trollers at bay :)

As this is a volunteer position, there is not a "required time" that you "Have" to spend. However, it is important that the coordinators wish to be a part of the program and work with their community as much as possible :)

Obviously if you are only going to be online once or twice a month, this would not be the postiion for you.

I won't fool you, being a coordinator has its downsides. You have to be committed to your Forum, and it will require dedication. Yet it is a great way to give back to the Renderosity Community :)

Hope this helped to answer your question :)
Have a great weekend
ladynimue