There's a good essay over at Adaptive Path about all the new exciting stuff coming out: http://www.adaptivepath.com/publications/essays/archives/000430.php
The link in the middle of the article on the "Ajax" development technique used by companies like Flickr is a good read too.
Oh, and look, coincidentally, there's a Flickr badge on the right side of Freyburg's top page! Now if only he'd get off his ass and take more pictures! :)