Google Docs Drawings is pretty good too for real simple wireframes. Easy to use and share, can see changes made to it by others.
Has anyone utilized any of these tools to create clickable HTML prototypes that can be hosted?
Pidoco has this functionality. Wondering if any of the other tools do as well.
It's not built into the product, but Napkee (http://www.napkee.com/) can make both HTML/CSS/JS and Adobe Flex 3 versions of Balsamiq Mockups BMML files.
OmniGraffle, Balsamiq, AxureRP and Visio are pretty much the industry standards. Mostly OmniGraffle and Visio. The fact he doesn't even mention Visio just goes to show.