Just got an announcement from the Cytoscape mailing list that videos of the presentations from Developer’s retreat are available. You can go watch them here: http://portal.ncibi.org/gateway/cytoscape2010.html
PS: I hate when applications take over my browser, relocated it and resize it. Sorry about that–nothing I can do. But eventually the video comes up and you can resize it. I recommend opening them in a new window to get started.