Lets say you go and research a topic, lets say something that gets some decent traffic.
How about, antivirus?
Now you do a simple misspelling test and find out the common misspellings. So you register it for $8 or so, and then you put it on auction at sedo (anitvirus.com) and with under 10 hrs left, you already have a bid for $500..
Not a bad profit for some quickand easy research. Makes domaining look easy. For more information on the domain market go to www.greatdomainstoday.com