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I'm developing a site with a client side javascript framework (dojo/dijit) at the moment. As with all javascript/framworks you start using Ajax to do quick calls and updates. My question is there a general rule of thumb when to use Ajax and when to use a link? I only ask because I seem to be using Ajax more then not and I'm worried that any errors in the initial page might propagate to other elements. Or with content getting constantly replaced something might go wrong.
I suppose what I'm asking is there any downfalls to heavy Ajax usage in a web pages?
EDIT
SEO - not an issue. I'm just thinking of client server issues for now. Links would bet Ajax hands down if you wanted good SEO