Damn it! That's what I hoped I wouldn't have to. Especially the example under the form.
"Crosstips helps you finish that crossword you're stuck on."
"Need help with your crossword?"
"Can't solve a tough crossword? We're here to help..."
These aren't very good, but at least I know what the site is for now...having a description will also help with SEO.
I wouldn't want to see a slogan every time I visited the site, anyways.
Change the tip word daily to mix it up a bit.