Lots of great advice. Thanks.

Generalizing and expanding a bit:

• Know your fixed and variable costs, and keep both as slender as possible consistent with running a great business.
• Reduce debt.
• Build a cash reserve.
• Market energetically even when times are flush.
• Build great relationships with clients, colleagues serving clients in related niches, and competitors.
• Make plans now for what expenses you can cut right away, and what you can cut in a week or a month.