Hi Griff,

With 401,762 or 21,800,000 making money online Blogs... Depending on who you Ask...

I wouldn't recommend touching the Topic...

Unless you've got a Unique idea, maybe Focusing on Particular business types, Niche Demographics etc...

With Proven case studies... Creative Money making and Revenue that you're ready & willing to Start Sharing with your readers...

Here's a few Excellent Articles/Blog posts that might Help give you and others a few Brainstorming ideas...

Where to get ideas for a niche website
Niche website ideas are all around you. Here's how to see them...
http://www.associateprograms.com/art...-niche-website

Can You Make Money Without a Niche?
http://www.doshdosh.com/can-you-make...thout-a-niche/

How to Choose the Right Blog Niche: A Simple Three-Step Method
http://www.doshdosh.com/how-to-choos...e-step-method/

Does Your Blog Focus Upon a Niche Topic or a Niche Demographic? - a Mini Case Study with Gala Darling
http://www.problogger.net/archives/2...e-demographic/

Lots more Good reading and a Ton of Hidden Keyword Niches with a little Googling...
https://adwords.google.com/select/KeywordToolExternal

Phil