In my earlier post, “Are we ready to adopt Ajax to improve usability?“, I highlighted that best bet for the existing sites is to start small may be including an ajax based components or use ajax to validate form fields etc. Here is one of the example.
This is an Ajax based Opinion Poll which is provided by dPolls which can be a component by itself. So we can build our own components like this and can achieve low to medium improvements in user experience without much risk and low cost.
So just imagine if we able to implement Ajax for small things, how much difference it can bring in user experience and that too without much redesign of existing site and not much commercial cost.