I just submitted my first proposal for ApacheCon US 2007. It’s a modified (and expanded) version of the one I gave at ApacheCon US 2006. I’ve had very little feedback about how the talk went in Austin, so have no idea if they’ll want me to speak again – but nothing ventured, nothing gained!
I’m also debating submitting another proposal, but when I submitted it before it was rejected for varying reasons. I’m not sure the new version I’m proposing will fare any better, but if I can arrive at a form of words I’m happy I’ll probably fire it off and see.