If I'm playing for more than 15 minutes, my hands will get a good bit on moisture on the fretboard.   For my cheapy bass, I just wipe it down when I'm finished.  But for my new Orion (ebony fretboard), do I need to do anything more as far as treatment/maintenance?  I was concerned that the salt from the sweat might have some long-term affects on the ebony.  I want to keep the bass in new condition forever...or as long as I can.  Any input will be appreciated.

Search on the club (up in the right corner) for Lemon Oil.
There have benn acouple of discussions of this in the past.
Mike

And Lawrence; as you will see from the posts found in your search, it's not just any lemon oil.

Indeed not.  You must have Dr. Snitz's NEWfangled medicinal lemon oil and brewing compound!  Takes the schvitz right off your fretboard!

Oy Vey, Such a thing! It removes all the schmutz Bubala!