Michael Coslo wrote:

Just what percentage of Amateurs are active ones, defining active as
either being on the air regularly, or participating in Amateur related
activities on a regular basis? (like say on a weekly basis?)

As others have said, this is tough to get a handle on since one of the
things it depends on is the definition of "active".

There are not many numeric measures of activity, but one that comes to
mind is the number of people who vote in the election for ARRL Section
Manager. In the following, the number of votes is taken from the ARRL
web site and the number of hams from
http://www.speroni.com/FCC/ARRL/State1A.html

Kentucky, Feb. 2007, 527 votes, 8534 hams, 6% voted.
Texas, Feb. 2007, 1577 votes, 42,949 hams, 4% voted.
New Hampshire, May 2007, 513 votes, 4825 hams, 11% voted.

You can speculate about how much correlation there is between "active
ham" and "voted in ARRL election for SM". I am certainly NOT suggesting
that this is an accurate measure of the activity level of the ham radio
community, but it's an interesting number.

73, Steve KB9X