"The 100 Most Influential Taglines Since 1948". Here are their top 10:

1. Got milk? (1993) California Milk Processor Board
2. Don't leave home without it. (1975) American Express
3. Just do it. (1988) Nike
4. Where's the beef? (1984) Wendy's
5. You're in good hands with Allstate. (1956) Allstate Insurance
6. Think different. (1998) Apple Computer
7. We try harder. (1962) Avis
8. Tastes great, less filling. (1974) Miller Lite
9. Melts in your mouth, not in your hands. (1954) M&M Candies
10. Takes a licking and keeps on ticking. (1956) Timex

(Via Neatorama.)