As is mentioned on php|architect's site today, the call for papers for this year's ZendCon is officially open.

Jayson Minard, ZendCon 2010 Conference Chair, sent the news to ZendCon veterans just yesterday, but that doesn’t mean that the rest of us who haven’t presented at this PHP conference can’t join the fun! [...] Minard mentions a number of topics for which they’re looking for proposals, including PHP development and best practices; working with SQL databases, search engines and alternative data stores; UI, AJAX and Rich Internet Applications; agile processes and project management; and real-world case studies, designs and data models—among other areas.

If you want to get your proposal in, you'll need to get it in quick - the Call for Papers ends on May 6th, 2010. This year's ZendCon conference will run from November 1st through 4th in Santa Clara, California.