This gives information about banners and buttons used in advertising:
Here are standard banner and button sizes listed by the IAB (Interactive
Advertising Bureau). Those in a lighter shade of gray are part of the
IAB's Universal Ad Package.

The Interactive Advertising Bureau has published
guidelines regarding rich media using many of the above standard
banner sizes. A disturbing aspect of the guidelines is that recommended
maximum file sizes are so high that pages would take excessively long to
load, violating one of the key principles of good website design.
Visitors will leave a site if it has too much advertising. BurstMedia
reported (Sep 2002) that 36% of North American visitors will leave a site
with too many ads.
[more...]
These are older banner sizes that used to be common and which still are
used:
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