I like Dan Kennedy's father's (some of you may know about the cufflinks):
"You can't do business sitting on your ass!"
Ok, it's not really a slogan, but 99% of the people who don't succeed (and want to, but feel they need to take one more course or read a few more books first) should take it to heart.
Most slogans miss the point, in my opinion. But for large business slogans, I always thought the best ones are the ones that communicate a USP.
Like Gallo's "We will sell no wine before it's time." A little cheesy, but at the time with all the cheap imitators coming out and rushing their wines to the shelves, it set them apart.
Burger King had its "Have it Your Way" when McD's and others sold them "as is." (As I recall, that helped them gain an impressive market share at the time).
Even the recent "Live in your world. Play in ours" I think taps the teen market pretty well. But I'm no slogan or branding expert.
Ben Mack, I hope you'll chime in here...
John
P.S. I can tell you what I think sucks, though (see if you can match these slogans with the companies):
"We're on it."
"I'm Lovin' It!"
"Get the Feeling"
"Is it in you?"
"It changes everything."
"Your potential. Our passion."
"See what happens."