Some noteworthy bits from the first two days during the WebApps WG (see the mailing list for further details):
The XMLHttpRequest specification will go to Last Call again. Yay!
We are removing the concept of multiple views and the default view. The members of the interfaces of DOM Level 2 Views will be supported forever of course. This was virtually not implemented at all and the implementation with limited support is removing it. On top of that a lot of the newly and DOM Level 0 APIs did not take the view concept into account so architecturally it already did not make a lot of sense.
XMLHttpRequest Level 2 will define a FormData object which can be passed to the send() method. The FormData object will get a single method called append() which can be either passed a Blob or DOMString. After send() is invoked FormData is serialized as an multipart/form-data entity body.
XMLHttpRequest Level 2 will get support for timeouts. I am not a big fan of this since I am afraid people will start using synchronous requests more while they really should not do that at all (except in Web Workers). If this turns out to be the case I do know who to blame (apart from myself for caving in) :-)