I have only just found out about Google suggest. It is as it says on there site:
As you type into the search box, Google Suggest guesses what you’re typing and offers suggestions in real time. This is similar to Google’s “Did you mean?” feature that offers alternative spellings for your query after you search, except that it works in real time. For example, if you type “bass,” Google Suggest might offer a list of refinements that include “bass fishing” or “bass guitar.” Similarly, if you type in only part of a word, like “progr,” Google Suggest might offer you refinements like “programming,” “programming languages,” “progesterone,” or “progressive.” You can choose one by scrolling up or down the list with the arrow keys or mouse.
I’m not really sure how useful this would be too me on ‘would I use it’ level but progmatically it’s amazing. The JavaScipt involved is highly complex and has been dissected and explained by Chris Justus over at his blog. He has taken time to re-write the code and comment it so it is easier to read and understand. Well worth a look if you are a developer.
