They're not official Google creations, but a few third-party developers have already adapted the idea of Google Instant's real time search results to two other services: YouTube and Maps.
Last night, engineer Feross Aboukhadijeh created a service called YouTube Instant (and received a job offer from Google shortly thereafter). The result is a search engine that begins playing videos as you type your search queries. It's less useful than Google Instant, but pretty entertaining.
Perhaps more useful is Google Maps Instant, which starts putting pins on a map as soon as you start typing. What's really neat is that you can type in two locations and it will give you instant driving directions. They're both pretty neat examples of what this idea can do, and as we learn to love Google Instant we're starting to dream of other services in which we'd like to see it (come on, Gmail Instant!). Hit the links to visit the respective services, and let us know what you'd like to see the instant treatment given to in the comments.