jQueryUI has a pretty nice autocomplete widget that I use for most stuff:
http://jqueryui.com/demos/autocomplete/
I wrote this combobox 5-6 years ago (because there weren't any freely
available implementations that didn't suck) and though it predates
both jQuery and Prototype, still use it when jQueryUI's doesn't cut
the mustard:
http://www.barneyb.com/barneyblog/projects/combobox/
Both support local and remote completions. Last time I checked you
have to hack the jQuery one if you want to send back rich options
(e.g., with embeded images).
cheers,
barneyb
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