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Stretchy pages are done using percentages of the window size rather than pixel values. This works nicely with width attributes defining the horizontal size, but height attributes of tables are dodgy and not rendered the same in all common browsers.
Using percentages means you always have to try to make it look as good as possible in all resolutions as mixing defined widths and percentages is very hard to do and not very reliable. Worst case scenario is that the user sees a horizontal scrollbar.
What about design?
Table of contents:
What are "stretchy" pages?
The advantages of stretchy pages
Problems with stretchy pages
How to make stretchy pages
How to design stretchy pages?
What does it mean for HTML Programming?
Are stretchy pages heavier than non stretchy ones?