I purchased 1password over the long weekend and when I came in to work I was surprised that my 1password install on my work computer was not also registered. Apparently the key needs to be manually input into every installation.
I think the license key should be synced in dropbox or stored on a centralized server (or both). Synchronization of preferences should also be done in the same way. I changed the key binding for the unlock dialog on the installation on my laptop. It would be nice if I didn't have to change it for every installation.