Here’s a list of 20 great things you can do in your spare time, and also change the world in the process…

1. Come up with a better Second Life. The load time is slow, the graphics are annoying, and the world is filled with gambling and pornography. Build something better and folks will come.

2. Figure out how to stop the elderly from getting bilked out of their money. It happens every day. Seniors will pay for it. Just read the article.

3. Profit from rising gas prices. This can include delivery of gas directly to cars for bulk discounts, full-service stations instead of self-service, or some sort of alternative fuel that gets people around cheaper. Yes, I think I did discuss alternative energy at one point.

4. Immigration - This is merely the backbone to the history of economic growth in America. The recent wave of immigrants has brought tens of millions. Figure out what type of services they need and offer it to them.

5. Web Hosting - Isn’t that business a commodity? Sure. But it’s also subscription-based and very sticky. Figure out how to get in the game and you can earn some sorely needed cash.

6. Paris Hilton - Figure out how to capitalize on her character, or countless others like Britney Spears, Angelina Jolie, etc… As I’ve mentioned before, celebrities are very popular.

7. YouTube - Create something funny, interesting, or memorable. Make sure viewers will want to send it to their friends, and you have yourself a hit. Do it a few times, and you have yourself the making of a hit. Do it multiple times, and you’ll get acquired by CBS.

8. Personal Finance - Figure out what makes people tick and offer up some irreverential advice. Make it topical, interesting, but not too technical. Otherwise, you’ll end up in the same trashbin that sites like Pfblog find themselves in: Irrelevance.

9. Start Small - In today’s world, you shouldn’t be spending more than a few thousand dollars to test your startup. Even that’s too much. This blog was started for a meager $100.

10. Skype - Figure out what type of programs people on Skype want, and build it. Leverage the platform. It’s there to be leveraged.

11. The same advice goes for Amazon, eBay, MySpace, Bebo, Facebook, and any other open platform that you can think of. It’s open for a reason.

12. Provide the Plumbing - Cisco didn’t become a multi-billion dollar business because it went direct to consumer. It provided the plumbing so that you and I (the suckers) could try to make things happen. Levi Strauss made his money because he sold his pants to the gold rush masses. Now, that’s the way to make a fortune.

13. Beauty - There’s a whole world out there for beauty products (with unbelievable margins, btw). Can you name the one site where every woman goes to get their makeup? I can’t.

14. iPhone - Figure out a way to accessorize this phone through technology or product and you’ll have it made. After all, this will be one of the most successful phone launches ever.

15. Keep Your Day Job - This is much more profitable than not keeping it.

16. Identity Theft - This is one of the greatest potential revenue sources out there. Figure out a way to protect customers and you’ll have figured out the path to riches. Maybe send out confusing bytes of information so hackers trade and sell fake info. Now that would be interesting!

17. Baby Boomers - They’re growing (not just in waist size) and they’re still spending. While they supposedly have lots of cash, have you ever really been impressed with their spendthrift habits? In any case, financial services, anything government funded, and senior agility business (as I call the senior mental and physical exercise business) are all the rage. Get involved. There may be a few dimes left over for you and me.

18. Cell Phone Advertising - We all know that the online advertising market is now something like $40bb. The cell phone advertising market is set to grow, exponentially. Figure out a way to build something meaningful and get involved in a close repeat of the online advertising buyout history.

19. Real Estate 2.0 - Start buying and selling domain names. This is where all the action is and you wouldn’t believe the cash flows that you can achieve from this business. If only you could take out a mortgage on this? Hmmm…

20. Re-read this post and and the rest of my blog to find really great business ideas.

That should take a few minutes.