If you stumbled upon or wrote a particularly nifty bit of Ruby code, or you’re an expert on a particular aspect of Rails, you should apply for a talk !
The wiki; says:
We accept 25 minute and 50 minute talks and tutorials, but we are not strict on this so please indicate the preferred length of your talk/tutorial in your proposal. We may still slightly adjust this length depending on the response we receive. We would like to ask you to include a short bio when you submit your proposal. This bio will appear on the FOSDEM website and should consist of a single sentence description and an extended description; examples can be found in last year’s program: http://archive.fosdem.org/2008/schedule/events . Unfortunately, I can’t do anything myself (should i think of a subject), since i’m part of the organizing team, and other team members have already suggested that we will all be incredibly busy.