It's possible to export multiple files at the same time.

This is covered at
http://news.zdnet.co.uk/software/0,1000000121,39838925,00.htm

Yeah I saw it here yesterday: http://googlesystem.blogspot.com/2009/10/export-google-docs.html

They have an informative screenshot

http://3.bp.blogspot.com/_ZaGO7GjCqAI/SuQL1HqQR3I/AAAAAAAARXA/qaWzFt_6UJQ/s640/export-google-docs.png

Google post in German here:

"Mehr Bewegungsfreiheit für deine Google-Dokumente"
http://google-produkt-kompass.blogspot.com/2009/10/mehr-bewegungsfreiheit-fur-deine-google.html