What are the "core" business requirements?

[twistedpixel]

What would you say are the "common denominator" services and products all small businesses/entrepreneurs (offline or online) typically need?

Here's my list so far:

Business Entity (some form of business structure)
Office Space
Banking Services (inc Merchant Services)
Accounting
Funding/Credit
Insurance (Health, etc)
Phone/Voicemail
Postal Address
ISP (Internet access)
Web Site
Personal Computer
Office Desk/Supplies (SOHO)