Chris,
Store your tapes tails out... This insures that they are rewound each time they are used.

When rewinding and fast forwarding, be sure that the tape is disengaged form the heads.

Buy BASF preformatted tapes if possible. This will save head hours on the machine.

Clean the heads in the same manner as I suggested for the DAT machine.

ALWAYS double back up your tapes. With digital, you don't have it until you have it 3 times! If you don't do this, I guarantee you will lose a session sooner or later.

One last hint. When I got my ADATS, Alesis provided a bumper sticker along with it. I took this bumper sticker and applied it to the handle of a large claw hammer, length wise so when you looked at the hammer the word ALESIS ran the length of the handle from the hammer head to the butt of the handle. I then placed this hammer on the ADAT rack and told everyone who asked, "That is the Alesis hammer!" I swear, it made the ADATs run much better...
:D Kurt

Here is some info from Alesis:

http://alesis.com/support/notes/

There are several good articles posted there, and some about head cleaning and idler wheel cleaning.