The LinkedIn Nagios Users Group posted a link to a survey to gauge interest in Nagios conference in Baltimore, MD timed to coincide with LISA, the misnamed Large Installation Systems Administration conference.
If you're considering going to LISA (and you should at least consider it) and you'd like to attend a Nagios Conference at the same time, take the survey.
I'd like to go, I just can't afford the price tag, and I know my work wouldn't cover it.