A great idea would be to buy a load of domain names using peoples surnames, ie smith.com and market them as personalised emails... ie "john smith" see's this and buys
john@smith.com for example for $x per year, now we all know you could have xxxx number of
xxx@smith.com email addresses from one domain name or any surname for that matter so the potential is huge for someone.
I debated for a while but just don't have the time,nor the resources to set up a wesite with a suitable script.