1. Diamonds are forever (DeBeers)
2. Just do it (Nike)
3. The pause that refreshes (Coca-Cola)
4. Tastes great, less filling (Miller Lite)
5. We try harder (Avis)
6. Good to the last drop (Maxwell House)
7. Breakfast of champions (Wheaties)
8. Does she … or doesn’t she? (Clairol)
9. When it rains it pours (Morton Salt)
10. Where’s the beef? (Wendy’s)

HONORABLE MENTIONS

• Look Ma, no cavities! (Crest toothpaste)
• Let your fingers do the walking (Yellow Pages)
• Loose lips sink ships (public service)
• M&Ms melt in your mouth, not in your hand (M&M candies)
• We bring good things to life (General Electric)

Source: http://adage.com/century/slogans.html