Michael Arrington from TechCrunch published a terrific list of 10 companies he'd like to profile but don't exist. Usually when you find a list of business ideas somewhere it's either "get rich quick" spam or a suggestion to start your own pizza delivery service. This one is different.
Every single one of these ideas is highly interesting. Some of them have the potential to become huge businesses (e.g. "Online File Storage" and "Open Source Yellow Pages"). Some of them are smaller but are easier to build and could still support a very viable and profitable business. "Blog/website Email Lists" is one of those.
This is one of the most insightful and valuable blog postings I read in a while - thanks, Michael.
Check it out. If you're building one of these businesses, feel free to drop me a line to see if I can help you in any way.