For the last few years I've taken a real interest to online sales. I've started many websites, and started a few business based on the ideas. The biggest thing I've learned about web business is to trust online analytic data.
I like the fact that online businesses don't need to be based on emotion or intuition. You don't need to be a savvy business man to analyze data and simply choose an industry that sells a lot.
Weight loss is an industry that I have been in for the last few months, and I've had much success in selling weight loss products throughout the United States. However, I've been looking for an industry that would shatter weight loss, and have relatively low competition.

I found this industry in Horse Tack or Horse Supplies. This includes Horse Saddles, Bridles, Reins, Bits, etc. The industry is ENORMOUS! This picture illustrates some very simple data that supports my beliefs about the Horse Supply industry.
On the left are keywords that people search for within one month on Google, and the global search volume is how many times people search for that specific keyword. The data on the right is how much you would have to pay per click to have Google advertise for this keyword.
Keep in mind, this data is simply for Horse Saddles, it has nothing to do with all the misc. tack that can be sold as well. And in looking at the competition, there are a few sites that stand out, but the biggest of all of them is Horse Saddle Shop.

Here is picture of that homepage:
One interesting fact about this site is that the e-commerce is built using a very simple and childish tool called Yahoo E-Commerce.
Horse Saddle Shop ranks higher than any other Horse Tack site, often it appears in the number one spot for very highly searched keywords. They generate an estimated 30,000 visits each month.
In other words, the most competitive site in the industry is doing and awful job of optimizing their site traffic, and the industry is waiting for someone to come in and take that number one spot.
I want to take that number one spot and be the new comprehensive Horse Tack site on the internet. Throughout the next few weeks I will document my process of doing this.