John Battelle mentioned a new suggestion feature on Snap. It's similar to Google Suggest, but it's actually cooler in that it does substrings...in the words of Bill Gross, founder of Snap:
Google suggest is awesome, but doesn’t do substrings, just the leading characters of the search term, I believe. Also, Google shows you hit count in the index, not number of searches performed by users. Number of searches by users seems to yield useful results from the “network” of people in a collaborative filtering kind of way. Just try typing in, say PASADENA, or SOLAR ENERGY, or anything, and watch what a relevant list you get because it’s using the collective knowledge of the whole network!
Check out Snap.com to try it out