Pages codes not in HTML tables but DIV tags instead do perform better with the SE's spiders. What you have to remember with this though, is when it comes to updating old pages you are required to compleatly recode the whole page and div tags are controled by CSS.

Another common mistake is leaving your CSS code in your page source files. This compleatly defeats the object. They need to be in a seperate file.

There are spider "simulators" out there, that show you your pages in the "eyes" of a spider. They are GREAT.

One big tip i can give you, thats far more effective than recoding pages into DIV tags, is to find a spider simulator and make sure that when a spider hits your pages the FIRST thing it finds are your targetted keywords. Its amazing how many pages are ranked on words like "welcome".

My 2 cents