This is another idea for a content site based around curing people’s phobias. If you've never had a phobia you won’t quite understand how debilitating they can become.
You become obsessed with them and even sometimes can't function in the outside world.
Of course there are many, MANY types and levels of phobias and that’s why this content site is such a great idea. Plenty of room for lots of content to be created.
For a list of pretty much all known phobias, have a look athttp://www.phobialist.com/
That will give you a pretty nice keyword list to work with.