Just finished my talk on Grails at JAOO. It went very well, the room was packed out with people having to stand at the back. Grails was extremely well received and the audience enthusiastic.
The conference seems interesting, there aren't many low level technical talks. Most talks seem to be design or patterns or enterprise architecture talks. There are also many .NET talks, so its quite a diverse conference. An interesting concept.
JAOO uses a system of rating talks with red, yellow and green papers depending if the talk was rubbish, average or good. I managed 15 yellows, 98 greens and no reds. Not bad :-)