New this year on the Bluesfest web site is a great tool called "ViewTube". You can use the tool to create your own festival event calendar, but even better: you can check out YouTube video samples from all of the artists who are scheduled to perform.
So for example, if you're not quite sure what Buckwheat Zydeco is like on stage, you can check out his page and see some video examples.
If the Bluesfest webmaster is reading this -- are there any plans to let people link to their reviews, photos and videos of the shows after the fact?
Related: Ottawa Bluesfest Guide