I'm a big fan of Seth Godin's marketing ideas (especially this one about trade shows).
Since I read his blog each day and I've read one of his books, I sent him a quick email to tell him to keep up the good work.
And, less than 8 hours later, he wrote back.
You may have never heard of him, and may never care, but I do appreciate it when someone takes the time to say thanks.
I will now do him the favor of buying every one of his books.