We would, of course, also like it if you come to the tutorial in September. There, you'll be able to grill us in person. :)
Because every now and then we felt that we needed to provide more explanation, but didn't want to interrupt the flow of the presentation. This is as close as we could get to sidebars and remain friends with HTML. :)
Don't be alarmed at the number of them! They aren't all bugs. We wanted to highlight things that we thought might trip you up (usually, either because they already tripped us or one of our beta testers up).
A final note
Please report bugs of any kind... thanks!
(The copyright notice that covers all the text and software of this tutorial is in the file COPYRIGHT.)