What are good uses of AJAX?
Here are some things that I can think of: it would be interesting to hear what other applications of AJAX people have come up with.
1) Checking if a username already exists when someone signs up to a website (or similar: is there a record there already with the same email address etc)
2) Auto-suggestion tools: when you start typing, these tools query the database and list some suggestions in real time that can save you time typing and even help out if you're unsure of the spelling after the first few letters
3) Mapping tools and others where you are able to 'move' an image without the page having to reload each time.
What other uses of AJAX are there? 
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