Parking a domain you have to do nothing to make money, just signup to be paid at a parking revenue service and choose the right domains. Many people register typos of well know established big websites. Personally, I don't like this practice but it works for many people, I prefer stick to ordinary catchy names.
Awesome. On top of my head i think i have intelligent-indexing.com and goingbusiness.com and a few more that i cannot think of registered and just stored in the closet. might as well park them and make some money while we work on the sites
There are lots. Adsense Banner pr selling affiliate - is most effective if any one know how to do it.