You know what is a great business surprisingly is office supplies and office furniture. Every business needs them, and they buy every month, so you can get into a residual situation like with insurance.
There is a company called Shred-it, that has a great service, and they are a fantastic company. They have a unique document destruction service which helps companies protect their confidential info. The sales pitch is basically that an engineer making $80k per year is too valuable timewise to spend time destroying confidential material. They place a mailbox-like recepticle in the person's office, and they just toss the stuff in, and Shred-it comes around and destroys it.
Microsoft and basically everyone else who is big uses them. Their competition focuses on the fact they are cheaper than Shred-it, so they really have no competition.
I bet they are pretty big up in Portland.
http://www.shredit.com/