good summary of Web App Design Mistakes

I liked the summary of application design guidelines/mistakes

HTML v5.0

If your using a framework (abstracting HTML away from the dev) or hand coding it does seem that it pays to know your HTML and that HTML is not going away any time soon.

Since the arrival of the 'div' tag I have been advocating using them and not Tables - not everyone shared my opinion and it seems there is plenty of table work out there and for good reason in many cases.

HTML 5.0 - what does it do for us and how? I may not get to t all in one go but plan to break out some of the changes that might be of interest or have impact.

HTML v4.0 vs v5.0 Differences