Talks are no more than 5 minutes with no AV (no slides, no videos, no projector). They can be on any topic though we prefer topics related to System Administration. Please keep the content 'professional' in tone.
With only 5 minutes to give the talk it is important that you cut to the chase. I've seen some people make the mistake of spending a lot of time on something inconsequential like how to install the software they're talking about (and the talk wasn't about installation techniques). The best talks I've seen start with a solid explanation of the problem (in terms of the pain being caused) then explain the solution.
Because the talk is limited to 5 minutes, I highly recommend you rehearse in front of a friend or two before hand. It is worth it.