Well, the techniques presented at Seybould there are about web standards. That means using CSS2 and XHTML for lay-out. Using tables for lay-out isn't really valid. Think about it like using Excel to draw an image for you, and manage your Database with Adobe Photoshop. Now, that was a worst case scenario, but it's basicly what it all comes down to.
Tables were meant for tabular data. A blind person visiting a site don't want loads of images read to him as if it were data (in fact he can't). He would be better suited visiting a full-scale site coded to suite 508, WAI and well...blind people.
But it isn't all about blind folks. Web standards is about what the web should be about. Even though an user surfs around with NS4 or IE 3, he can still take part of the information, the design will be lost, but he can still read and browse as he should. Same with text-based browsers, who really don't benefit from flash or table-based lay-outs.
And it saves bandwidth. CSS2 and XHTML in conjunction, and the minimalistic approach of DOM scripting can cut down file-sizes by more than ½. Many sites would benefit from it.
So, please do not compare tables and stylesheets with Web Standard Compilant web pages, it's not the same thing.
I would also like to comment someone here mentioning getting a CSS2 lay-out to work in IE6. Well, the deal is that the site will work, the lay-out will only look a bit buggy, but instead of coding a whole new nested table to make a solution you can add one or two lines (or even characters) of code in a stylesheet to fix the issue or comment something out for certain web browsers.
Not to mention that all web browsers except IE 6 fully, or almost fully support XHTML and CSS2, with only minor bugs. IE 6 is no longer supported by MicroSoft, they're all busy with their new System and Web Browser (which is being released 2005).
I always do my sites with the latest web standards, because if we don't push technology forwards, nothing will happen.
http://www.zeldman.com
http://www.alistapart.com
http://www.stopdesign.com
http://www.simplebits.com
Are all great links.