Being at CHI is, as everyone here can testify, overwhelming. Lots of people and ideas. It is exciting, even though difficult to make sense of it all. One observation that I have talked to some people about is the apparent interest in theoretical papers. Again this year we have had some sessions with theoretical papers where the room has been way too small. I take this as a sign that the field is really in need of more theory and that there is a shortage of good theoretical and philosophical papers. Personally, I find this exciting and I hope that it means that more people will take the time and effort to engage in theoretical and philosophical work.
AND hopefully CHI organizers will remember to schedule these papers in bigger rooms in the future :-)