These examples should provide an idea of what works and why, but it's by no means a definitive list of the things that work. When launching your own site, following a tried-and-tested path can yield great results, but you're far more likely to succeed if you find a niche that really inspires you.
Miles Galliford, the co-founder of SubHub, suggests: 'Pick a subject that you enjoy so much that you would be happy to write about it even if you weren't getting paid to do so. You'll spend most of your waking hours thinking about it and speaking with people who share your interest. If you're not passionate about your subject, someone who is will probably create a better site than yours.'
With that in mind, let's see what others have made work for them...
1. Weight Loss, Fitness and Exercise
Diets and fitness are evergreen subjects, attracting large audiences in search of their body beautiful. Here, Bekah provides personalized training tips and workout routines.
2. Music Tutorial
Music makes the world go round, and also makes for a popular topic. Stephen Mann has amassed a huge following for his tutorial site.
3. Starting a Business
'How to start your own business' must be one of the most popular search engine topics in recent times of austerity, so this niche has naturally flourished. Many sites offer great advice every step of the way.
4. Make Money from an Existing Business
Making existing businesses more profitable is always a popular choice. The Entrepreneurs' Organization is a network of business owners from all over the world, enabling a peer-led community to learn from and influence each other.
5. Online Marketing
A plethora of sites offer advice on how to make the most of your online presence. Copyblogger teaches members how to create great content.
6. Investment Advice
Newsletters with investment tips have been around for a long time, and now there's a host of websites dedicated to regular updates. This Is Money offers discussion forums and expert advice.
7. Improve Your Personal Life
Dating websites are as popular as ever, but My Single Friend differentiates itself by encouraging well-meaning types to help their buddies find love. The big players may dominate the industry, but there's plenty of opportunities for related subject areas.
8. How to Guides
Sites geared towards educating and training make for fertile subscription ground. If you've got a hidden talent then creating a tutorial website can be very profitable.
9. Relocation Advice
These sites are catered towards people relocating to new places, providing all the info required to ensure a smooth move.
10. Lifestyle and Religion
Websites that create a real sense of community, centred around a kind of lifestyle or religious belief attract strong and loyal followings.
The membership or subscription model is a fantastic portal upon which many successful businesses are built, and knowing what works is great, but there's still plenty of room out there for you to carve your own niche into the Internet.
If you choose a subject that resonates, your passion will shine through and customers are more likely to buy into it. There's never been a better time to start your own site.