Just a quick note to share another event planning resource I just came across. It's meetingpages.com, and it's a very comprehensive set of online resources for meeting planners, including a searchable database of vendors and a variety of meeting planning tools, including free enhanced meeting planning software.
The only drawback is that they are targetted mainly to events and services in Colorado, Minnesota, and Wisconsin. But if you're planning an event in one of those areas, I think you'll find this very useful. And even if you're planning your event somewhere else, there's certainly enough helpful information and resources that it's at least worth taking a look!