Set up an affiliate account at clickbank. Go to their marketplace and search for products that will solve the problems, or are the answer to the questions being discussed.

Set up a blog or squidoo pages that relate to the affiliate programs.

Post a informative response and include your affiliate product in your response. A softer sell is to post a review of the product on your blog and then post a response to the list/discussion forum stating that you've reviewed the product and they can find out more on your blog. You can also set up a squidoo page and refer people to your squidoo page.

You will probably need to make 3 to 4 sales to earn $100 in commissions.

This is the way you can make real money on the Internet. The question is: Can you do it in 24 hours? It would be very difficult to research a niche or market, decide what need is hottest and that you have the knowledge for, write the report, write the ad copy or sales letter, set up a blog/website/squidoo page and then market the report. In the real world in real time, it's not feasible.

What you can do while you're working on the other ways to make $100 in 24 hours is jot down ideas you have that would the basis for a product. Then when you have the time you can start developing the product.

You can develop a short report, 2500 words or so, a long report, 2500 to 5000 words, or an ebook, 7500 words and up. You could also develop an ecourse that's a combination of emails, an ebook, chats, and perhaps conference calls.

Resources:

First rule don't pay someone to find out information about the "Get Paid To" companies.