Well, I went and registered pseudoprime.com at register.com today. (It'll take a few days for the link to become active.) I've been going back and forth between the idea of using jgrantham.com for my web pages, too, or keeping it for my e-mail only. But I'm content enough with my current e-mail setup that I don't want to change it around -- so I'm going to eventually put the web pages on pseudoprime.com. That'll set me up to ditch clark.net eventually.
This was partially inspired by a re-design of my web site. I've used cascading style sheets and a sidebar to give a common feel to many of the pages. I've also cleaned up the home page considerably.
Why pseudoprime.com? My dissertation title was Frobenius Pseudoprimes, and it's the subject on which I've done most of my research.