some of those are really good! Here's a few that I really like...

"There is no conversation more boring than the one where everybody agrees." - Michel de Montaigne

"Associate yourself with men of good quality, if you esteem your own reputation; for it is better to be alone than in bad company." - George Washington

"Great spirits have always encountered violent opposition from mediocre minds." - Albert Einstein

as I am, by profession, a radio geek (engineer) I really like this one:
"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat." - Albert Einstein, when asked to describe radio

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-Toast-
"It takes a lot of brains to enjoy satire, humor and wit - but none to be offended by them." -- Johnny Hart ("BC", cartoonist, 2000)
"Analyzing humor is like dissecting a frog: Nobody really enjoys it and the frog generally dies as a result." -- E. B. White