I looked in few places over the internet and found lists of websites ideas to make money online. This list is the fruit of my research, I tried to make it as complete as possible, knowing that it's actually extremely hard to pretend having a complete list:
1. Photography -- Buying and distributing photographs to calendar companies, postcard companies, magazines, newpapers, online websites and many more...
2. Baby Tips -- Have a resource site for new and/or expectant mothers and sell related products.
3. Wedding Ideas -- Make deals with local catering services, photographers, and bridal shops to receive a commission for sales generated from your Website.
4. Parenting Tips -- Write an informational e-book about parenting.
5. Pet Training -- Pet store online with free tips on training and grooming.
6. Camping -- Camping tips and resources.
7. Fishing -- Show people in your area the best spots for fishing, you may also want to offer few products they can buy from your website.
8. Travel (Tell others about the places your family has traveled - provide photos, maps, great eating places, etc. You can distribute a monthly "paid" newsletter about travel.)
9. College Resources (School supplies distributor, online college bookstore, etc.)
10. Crafts -- add how to video to help your visitors with all their crafts needs.
11. Wood Products (Ideas for creative wood furniture along with instructions and material resources.)
12. Sewing (Share your special sewing techniques with others around the world.)
13. Office Organization (You'll find that people who run a busy office are always looking for ways to improve the office atmosphere. You can show how to organize, prepare paperwork, manage and distribute work load, etc.)
14. Music (Music lovers will adore you for building a resource site for music lyrics, musical instruments and where to get them, music reading tips, etc...)
19. Computer Training
22. Business Services -- Bookeeping, transcription, accounting, computer programming, etc.
23. Special Interest (Perhaps you're a huge fan of a certain collectible item and would like to become a distributor or reseller.)
24. Horseback Riding Resources and Supplies
25. Bike Riding Resources and Supplies
26. Mountain Climbing Resources and Supplies
28. Driving -- teach people how to drive
29. Writing -- Provide writing secrets in a paid monthly newsletter.
30. Reading -- Provide services or materials that help children learn to read.
31. Surfing (in the ocean, of course)
32. Singing Lessons
33. Teaching Skill Course
34. Composing Music -- Resources
35. Instrumental (piano, guitar, drums, trumpet, etc...)
36. Cooking Tips -- Offer a cooking tips newsletter.
37. Cooking Recipes (Perhaps you've discovered the secret to cooking brocolli casserole just right, or... know someone who has?)
38. Jokes (Build a site of jokes to keep your visitors laughing and laughing and laughing...ha...ha... Send a joke a day via email for a small fee.)
39. Comedy (Not limited to jokes, but just fun stuff you find on the Web.)
40. Art -- Open an online art gallery.
42. Chemistry (Maybe you've found a simple solution to help students improve their understanding of chemistry and could sell a report about it.)
48. Mountains -- Books about, reports, travel guides
50. Mysterious Discoveries -- Newsletter, books about, reports
52. Cultures -- Newsletter, reports, books
54. Geography -- Maps, guides, pictures, etc.
55. Holidays (Have a Holiday theme for your site - change your site to suit each season.)
56. Languages (Include a listing of each language you can find and provide links to Websites that teach different languages.)
61. Games (Provide links to places where people can play free games online -- not necessarily gambling -- but, Monopoly, Scrabble, Wheel of Fortune and Jeopardy found at Sony.com, etc.....)
62. Interior Decorating
66. Garage/Yard Sales
72. Retirement (Information about successful retirement, best retirement locations in the world, money management, etc....)
73. Stock Market/Investing
74. Special Interest Books
76. Weight Loss (Tell how you lost weight to help others.)
78. Teenage Years
79. Home Care and Aid (Give tips about how to care for elderly or disabled loved ones, resources for medical assistance, etc...)
81. Handy Work (Maybe you can offer great tips for fixing things around the house.)
83. Flying (airplanes, helicopters, etc....)
84. House Keeping
87. Children (Develop a site for children or about children.)
88. Gold/Silver (coin collections, value, going prices)
89. Unique Jewelry
92. National Parks
93. Archeology (An up-to-date factual site about ancient artifacts or a study of the history of archeology will be sufficient.)
95. Shopping (Tell about your shopping experiences with local stores or National chains.)
96. Real Estate (Provide a free real estate site for your area.)
97. Safety (First aid tips and maneuver demonstrations for life-saving.)
98. Science Fiction
99. Marriage Secrets (Website tips for men and women to make their marriage work.)
100. News (Provide daily or weekly updated news for your local region.)
101. Entertainment (Your local area may benefit from an informative entertainment site -- new movie arrivals at the theater, special events in your town or surrounding areas, etc....)