Recently I've been looking into ways to make extra money, and have been thinking about investing in expired domain names. These names can be bought for a song, and if I could come up with an easy, sure fired way to market them, it might be a lucrative side job. Of course, one can always buy domain names for sale, but the expired ones are generally less expensive. Being a researcher by nature, I'm thinking about putting together research on expired domain names in areas that interest me, like the environment and conservation, so that I could stay interested in what I was doing, which makes the research process so much easier.
There are free tools on the Internet for determining traffic levels for keywords, and some of them will give you specific results on how often keywords are used monthly on search engines like Google and Yahoo. Armed with the keyword search results, I could write short reports on the opportunities that the expired domain names for sale would give a business who could launch a website based on the domain name.