Ways to make extra money

I obviously haven't tried all of these methods, but when possible I've tried to link to an example of the opportunity actually making money. You should be able to find something here that fits you and your skills.

1. Delivering pizzas (TheHappyRock). If you have a car and a decent driving record, then you qualify for this easy extra-money maker. You're likely to get some free pizzas, too.
2. Waiting tables (Serious Eats). This is the perfect job for nights and weekends. That's when all the big tips are made anyway. Pick the nicest place in town.
3. Bartending (The Beck Office Blog). Even better, I think, than waiting tables is tending bar at nights in a busy bar -- typically at least $1 for every drink you serve.
4. Teaching swimming lessons. If you're a good swimmer, you might be able to pick up a weekend swim-teacher gig at your local recreation center. Keep in mind that some places may require a special certification or that you be a lifeguard.
5. Car valet. If you hook up with a for-hire car-parking service (the type hired out for fancy neighborhood parties) you can make some nice cash tips in just a few hours at night and on the weekend, when parties are held.
6. Create Web sites (glblguy). Businesses will pay you to take them online.
7. Blogging (ProBlogger). This isn't quick money, but you can make decent money with a little luck and a few months of solid, consistent effort. Believe me, it can be tough and a bit time-consuming, but it can be done.
8. Write an ebook (Daily Blog Tips). I hesitate to put this one in here because an ebook by itself usually doesn't make money unless you're an excellent marketer. What a great ebook can do, though, is act as a sales lead to one of your other online businesses.
9. Design Web logos (Logos For Websites). If you're good with Photoshop and can work quickly, you could make some decent cash with this online business.
10. Rewrite poorly written ads. Search the ad listings at eBay and Craigslist for big items like cars. E-mail the seller and offer to rewrite the ad for a 1% commission.
11. Write reviews (Bible Money Matters). Many Web sites will pay you a little cash to write product reviews. If you're knowledgeable and can write fast, this may work for you.
12. CashCrate. There's some money to be made with CashCrate by completing the free offers, but the real cash comes from the referral program.
13. Freebie trading (ChristianPF). Freebie trading is a real moneymaker. But it takes a special person to master the techniques and be consistent with the process.
14. Freelance writer. Right now Elance.com is looking for more writers. Set up an ad and start offering up your fast writing skills.
15. Sell digital photos (Digital Photography School). Take nice pictures. Get them up on the Web at a broker or microstock site. Make some money. It's not as easy as that, but those are the basics.
16. Sell yourself online (I Wear Your Shirt). Get creative and sell you and your time online in a fresh, new way.
17. Sell micro ad space online (The Million Dollar Homepage). Start a Web site and sell tiny ads. Can this be duplicated? Or can you take the concept and make it fresh?
18. Start an online store (Gather Little by Little). Setting up an online store is extremely easy with sites like Amazon, eBay and CafePress. Once you learn how to market that site, you can begin making some cash.
19. Focus group participant (Paying Off My Future and Bargaineering). Researchers need people to help them develop their results. Become a member of a focus group in your area and get your share of their research funding. Call your local university or museum, or look in your local paper for opportunities.
20. Sell bottled water (Neville's Financial Blog and katekashman). Buy bottled water in bulk and sell it for a dollar where there are a ton of people -- parks, festivals, concerts, etc.