The Particletree weblog has a great tutorial on Preloading Data with Ajax and JSON. This is a neat technique to help speed up the responsiveness of your web applications I anticipating the next move of a user of a piece of software. The basic idea here is that since a website user has a finite amount of choices, some of which are more likely to be made than others, it should be possible to pre-load the results of an action like clicking through a link to a page or hitting a banner. When this is done, the eventual action seems to happen almost immediately because the data has already been preloaded.
Preloading Data with Ajax and JSON
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