Of course, soon we’re going to need an IDE to do all things AJAX for us. Microsoft’s started working on this with Atlas Project. I bet Dreamweaver will have some support for it in the very near future. Probably as soon as version 8.
In the meantime, we’re going to need to know DHTML and Javascript to do everything by hand. I hate hand coding Javascript!
Here’s another cool tutorial on DHTML from Sitepoint. Search on webmonkey for a DHTML tutorial too. I love webmonkey’s tutorial.