Bob,
Fatman suggested what I would, shaving cream. I played ball from pee wee in grade school all the way through my second year in college and used the Barbasoll on my glove nearly everynight.
I don't know if it is the best choice, it doesn't make things waterproof, but it was hard to beat for keeping sweat impregnated leather soft. I never had a crack develop in a glove (I still have every glove I ever played with) and they always were as supple as could be expected.
All the other products recommended are great choices for cleaning, waterproofing and preserving. Might try the shaveing cream to bring it back, then put some of the other stuff on to keep it in good shape.
OkKeith