One of the interesting things about Ajax is how you can build more responsive-looking applications (for example: www.objectgraph.com/dictionary/).
However, there is a downside to such applications. Consider, if you will, the transmission of non-used data. If you type too slow, you will see fetches for objects you will never really use. You see this as well in sites like www.snap.com or Google Suggest. Now, fortunately, this data transmission is relatively minimal, but imagine this on a wider scale. It could result in unnecessary transfer and server hits that, on a large scale, could really bog down a site or app. What's interesting in many Ajax apps is that you often will see very wordy XML data streams being sent -- where the data is often far smaller than the tags used to describe it!
Hmmm, maybe a little httpZipping would help...
- J.W.
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