A good tag line adds focus and purpose to a brand. It should be short enough to be easy to remember and repeat. It should avoid industry-specific jargon so it's easily understood by everyone. It should describe a company's mission succinctly. The ideal tag line will inspire the company as well as its audience. Here the best ones, ranked by taglineguru.com:
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. Think different. (1998, Apple Computer)
Once you've settled on your tag line, don't just leave it on your business card. It should be everywhere, and always integrated into your marketing campaigns with promotional products.