The internet is full of tutorials explaining those little tricks about AJAX, how to handle XHRequests and all that low level stuff, but nobody tells you how to design the entire application, nobody gives you the overview on how all these things should work together. What good is knowing all those fragments if the developer is unable to put them together to a real use? We have libraries to abstract from the Browser dependant things like actually doing XMLHTTPRequests, and we should concentrate on higher level design to give our clients (or visitors) good and usefull applications.