Thanks! Well, I just got back from REI where I had them install my clipless pedals and got to practice clipping in and out a few times. I think I'm going to need to practice many more before venturing out on the road with them! Also bought some 1 inch slick tires. The salesguy said he used the same kind on his mountain bike for a long (multiple days) trip to Mt. Whitney. I never thought of using skinnier tires on a mtb. Guess I figured the weight of the bike would be prohibitive. We'll have to see!

Next will be the saddle. I did get some bike shorts with chamois last week and wore them on yesterday's ride. Didn't seem to make much of a difference, but again, I think I've got a crummy saddle, so probably nothing will make much difference until I get a better one! So, guess I need to measure my sit-bones (what an entertaining thread!) and then go test-ride some saddles! At least some of these things will transfer over to the new bike (pedals and saddle) . . .

I'm going to look into your other suggestions and, yes, I'll keep you posted! Thanks for the warm welcome.