I used to have an obsession about reserving a great name or two whenever a new service came out. I worked on my own shareware application, and I never knew where I would branch out for my next app.<p>I registered apps.facebook.com/docs when Facebook Apps first came out. Facebook took that name (the Canvas URL) away from me within days, however.<p>I still have my three letter twitter account name, as well as usernames like "Call" and "Cards" on one of the biggest and most-advertised poker sites, from when they were in beta. I've found it interesting to see which companies would take back their names after realizing they let a good one go, and which would not.