Shop Until You Drop is the most professional of the mystery shopping websites that we have found. They also have the largest mystery shopping company database with 212 companies listed (our researchers found 2 broken links).

Good explanation of shopper privileges. Members area of the website is efficient and easy to navigate. The site offers what they advertise--access to qualified mystery shopping companies and good training to help you implement their strategies. Professionally run with excellent customer support. One unique feature is a Shopper Profile which allows you to register the type of shopping you want to do.

Then the company notifies you by email once a company requests a particular type of shopper. Numerous added bonuses.

A very close 2nd. Excellent customer support. Well maintained database of 182 mystery shopping companies (our researchers found 3 broken links).

"Insider's Secrets & Tips" is very helpful for learning how to be the most effective shopper (and to have fun doing it). Links directly to shopping companies' applications page.

Good explanation of shopper privileges. Extensive company database--152 companies listed (our researchers found 3 broken links).

Professionally staffed and responsive to customer needs. Fastest customer service response of all sites tested. Most realistic expectations of earnings. Special offer right now for free ebooks which show how to make money in other ways on the internet.

One of our two #1 picks. A former dental hygienist reveals her secrets about how she makes up to $11,000 per month on eBay. Excellent information on how to find products below wholesale to resell on eBay. Proven techniques for attracting large numbers of buyers.

Offers a free informative newsletter even without signing up. Honestly, there is some fluff in this ebook (we suggest skipping directly to Section 2), but it is still by far the best resource we've seen on starting and managing an unusually profitable eBay business.

We have a two way tie in this category. This idea is truly innovative and deserves a #1 slot as well. Silent Sales Machine is simply an idea that not only turns your eBay auctions into a business that runs all by itself, but also makes exponentially more money than just selling items on eBay one by one.

By filling in two blanks on one very simple but powerful question, you find out how to make potentially hundreds more per auction item, even on items that don't cost very much. The ebook is absolutely packed with powerful information. We particularly liked Chapter 12, "Creating Money from Thin Air on eBay." - home business