It's been a while since I covered Appengine, but the team at Google hasn't been idle.
Google App Engine Blog: Python SDK version 1.2.4 released.
Meanwhile, the Appengine blog added an extra article describing the new features:
http://googleappengine.blogspot.com/2009/08/new-features-in-124.html
XtreemFS is distributed, replicated, open source and works for Windows, Linux, Solaris and Mac is in the works. For those working with remote file-systems over multiple OSes, this might bring some relieve.
The usual suspect news have it:
heise online - 14.08.09 - Verteiltes Dateisystem fürs Internet
Golem.de: Verteiltes Dateisystem XtreemFS 1.0 erschienen
Ubuntu One: Onlinespeicher für Ubuntu-Anwender - Golem.de
Ubuntu One: Onlinespeicher für Ubuntu-Anwender
Cloudbasierter Dienst geht in die Betaphase