Build an AJAX-Powered Shopping Cart
NETTUTS shows us how to build an AJAX-powered shopping cart using PHP, jQuery and some plug-ins.
AJAX Username Availability Checker Using MooTools 1.2
When allowing a user to register a username, you can use AJAX with MooTools to let them check the availability of the username being submitted.
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1. AJAX AutoSuggest: An AJAX auto-complete text field
2. AJAX Autocompleter / script.aculo.us library
4. Ajax autosuggest/autocomplete from database