I recommend reading the java.net terms of participation
(http://www.java.net/terms.csp) carefully, if you are asked to agree to
it. Pay particular attention to clause 12.
This issue was raised earlier, but I still see the clause there. They
may have limited the services for which you need to agree to this.
Based on my understanding of this agreement, as an HP employee, I would
certainly not agree to this without consulting an attorney.
Re: JavaOne
I did give a JavaOne talk last year. I agree that it's a mixture of
good technical content and marketing.
The talk acceptance process is very opaque to me. The talk slides for a
technical presentation have to be cleared through a Sun technical and
legal review. I actually found the former quite helpful (since it
caught some bugs) and the latter very annoying (since in my case it
added technical bugs way too late in the process).
In spite of all of this, I think that open source submissions to JavaOne
are probably a good thing.