Speaking for myself, I think one of the things that so fascinates me about sailing is that it constantly challenges me. I have never stopped learning, and as long as I am still sailing, never will.
Granted the learning curve is not nearly as steep as it used to be. One thing I started doing about five years ago is keeping a note page that I add to after each regatta. The "big " lessons are mostly behind me now, it is the "little things" that are easily forgotten from one year to the next that I learn and write down. I review my pages of "hen scratching" before each regatta to refresh my memory.
I re-read "Welcome to A-Fleet", and Rick White's "Catamaran Sailing for the 90's" each year, and I try to read at least one new book on Tactics and "Strategery" <Grin> each year.
I attend any seminar that might be availabe. Also, I try and attend any protest hearing that will let me either participate (hopefully as a judge, not a protestor or protestee) or observe, in an attempt to gain a more complete understanding of the rules. Also, reading and participating in forums such as this one is a great source of wisdom.
Sailing is kinda like the game of Chess, no matter how good you may get there is always someone better that can teach you something.

Dats whut I tink.

Stephen
H-18