Things to Do with a Parked Domain Name
What is a parked domain name? If you buy a domain for future development, you can just "park" it and sit on it until you are ready to build a site, in order to keep cybersquatters from purchasing it. Another option, however, is to add advertising to it and have it dynamically update the ads to pull in revenue while it is parked. David's Web Hosting talks about parking domain names on his blog.