Tool List
Justin Williams has an updated edition of his developer and power user tool list. Of note, he has a Magic Trackpad, which I’ve found to be terrible for pointing and clicking, but he has it to the left of the keyboard and uses it only for gestures (with the left hand, I guess). On the other side, he has a real mouse (a Razer).
Secondly, he recommends Library Inspector, which has far fewer features than my preferred Hopper, but it may be simpler for certain tasks.
Update (2012-10-17): Clark Goble lists his tools.