The purpose of market research is an important one: you are going to determine who will buy your product, where they hang out both on and offline, and how you can best reach them through advertising your autoresponder program. The more you can pinpoint your target market, the better success (and profits) you will see.

Here is a partial list of topics to choose from that have high marketability factors:
Making money
Investing money
Saving money (on consumer purchases)
Starting a business (online or offline)
Running a profitable web site
Dieting and weight loss
Time management
Relationships and dating
Finding a dream job
Working from home

eBay

It is said you can buy anything on eBay, from cars and computers to clothing formerly worn by celebrities. This massive online consumer marketplace and auction house is a haven for buyers and sellers looking for great deals from the comfort of their own homes. Searching for products related to your topic on eBay can help you home in on
your market. It will also help you determine how much buyers are willing to pay for products related to your subject.
Follow these steps to exploit eBay for information:
1. Sign up for a free eBay account. This personalizes your experience and allows eBay to provide you with relevant information every time you visit.
2. Go to the eBay home page and log in.
3. Choose one of the categories on the left-hand side of the page that is relevant to your topic and browse through the listings, or search for a specific item or topic using the search bar at the top of the page.
4. Make note of the price ranges people are willing to pay for items or products related to your topic. This will give you a general idea of what to charge for yours. Also, note how many products are available related to your topic in comparison to other topics. This is not limited to books: you might find CDs, audio programs, or one of many forms your product can take.

Amazon

Amazon.com, the other internet consumer giant, is similar to e-Bay in that you can find just about anything you want to buy. Their biggest selection is in media: books, movies and music; but they also have an enormous inventory of electronics, toys, jewelry, clothing and accessories, and much more. Where e-Bay concentrates on selling used products through auctions and classifieds-style advertising, Amazon carries new products along with a healthy dose of independent sellers touting used wares.
Your purpose in using Amazon for market research is twofold: you will identify your competition and find out how popular your topic is, and you will familiarize yourself with how Amazon works, as you will likely want to consider making your product available through Amazon. Here is how to check it out:
1. Sign up for an Amazon account, if you do not already have one. Like eBay, Amazon will give you personalized recommendations based on your searching and buying history, and keep you updated with the latest available information on your topic.
2. Once you have signed up, go to the Amazon home page and log in (you may be automatically logged in; Amazon really likes keeping track of its customers and often will keep you perpetually signed on, even when you leave the site)
3. Using the search bar at the top of the page, choose Books from the dropdown list and type in your topic or keywords. The results you get will be both print books and e-books. Since Amazon deals primarily in new product, you will be able to view the retail price of competitive products.
4. Make note of prices and the number of titles available relating to your topic. Also, you might want to consider checking out the Listmania sections on the product pages you view (you can find this by scrolling down on the page, almost to the bottom). Listmania is an Amazon program that promotes customer recommendations by allowing Amazon users to compile lists of their favorite books on Amazon. Checking out Listmania picks helps you understand what type of product your target market is interested in, and how much they are willing to pay for it.
5. Once you find a product, if you scroll down past Listmania you will find sections on similar items by category and similar items by subject. You can browse through the available products related to your topic in this way without going back to your search results page.

So, you have to work to do. Most important is to take action!