[jQuery] Ajax to update multiple fields

Hi All,

Brand new to jQuery, and looking for suggestions.  I have a "customer" 
form, that I need to do a lookup when they enter their email address, 
and have it fill in the name, address, city, state, zip, etc if they are 
already in the database.

I am not following the ajax tutorials that I've found online so far very 
well.  Can anyone suggest some good, simple tutorial, or is there an 
example piece of code somewhere that fills in multiple fields when one 
changes?

Thanks a bunch!

-Scott