jQuery has a special Ajax function just for getting JSON, appropriately named &.getJSON(). It looks extremely similar to GET:
// Success! Do stuff with data.
The difference is that the data object in the callback is a ready-to-rock object full of data you can do whatever you want to with. Likely loop through it append stuff to the page.
So far we've talked about $.get, $.post, and $.getJSON - but it's worth noting that these are all just convenience methods that ultimately call $.ajax. If you prefer being very specific about all your Ajax options, you can use that directly.