The div thing is like:
<div id="position underneath navigation"> here is the page content </div>
<div id="position at top of page"> navigation stuff here </div>
using CSS to specify the position of each div.
The table trick is such that the top left cell of the table has no content (and zero height), and the top right cell has the proper page content which then is the first thing the spiders see. The bottom left cell has the navigaion within, and renders normally, but appears after the content as far as spiders go.
Both methods are valid, but it is unknown how much of a boost you get from using them. Most people would not class either method as being spam.
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