How many people here have any sort of First Aid/CPR training, or have
considered getting some?

BLS (CPR) & ACLS (Advanced Cardiac Life Support) and instructor in both.
Often when I fly I have my anesthesia equipment with me as I fly to work
with my residents.

If you've had training, are you legally & practically current in it?

Absolutely !

A CPR ticket is legally valid for three years - practical currency,
as always, is another matter!

From our studies, we have found the vast majority of dentists and their
staff (and I'm sure physicians and other health care providers too) cannot
perform reasonable (not perfect) CPR in as little as six months after
taking the course.

Also, "legally valid" is poor terminology. For a few years now the card
simply says that you have "successfully completed the curriculum" on a
particular date. I haven't taught the American Red Cross BLS courses in a
few years, but they expired after one year. The American Heart Association
courses expire after two years. Who issues a card for three years ?
--
Ken Reed
http://www.dentalzzz.com