The ConFoo team just opened its call for papers. Candidates can submit proposals until September 23. Consult the call for papers page for details and to start submitting. That page also explains what expenses ConFoo can cover for speakers. You can even get advice on how to write proposals. The call for papers is public, meaning that all proposals get published on the website for others to vote and comment on.
This year's event is happening from February 25th through March 1st in Montreal, Canada with tracks covering things like .NET development, Project Management, Web Standards, DevOps and, of course, PHP. The Call for Papers closes on September 23rd so you have less than a month to get your proposals in!