Maybe you have seen my Tweet, but if not, I got myself an Amazon Kindle before Christmas, a Kindle 3 with WLAN/3G.
There is a lot of books to be downloaded from Amazon, but almost nothing in Germany.
Some tools that can help you with bringing content to the Kindle:
- Calibre http://calibre-ebook.com/ comprehensive eBook-Management
- Auto-Kindle http://sourceforge.net/projects/autokindle/ to convert PDFs into MobiPocket format for the Kindle
- MobiPocket Creator http://www.mobipocket.com/en/downloadsoft/productdetailscreator.asp – more functions than Auto-Kindley, but YMMV
And yes, the Kindle can read PDFs, but will render them page by page which is in many cases impossible when you want to read longer stuff.
Zweitausendeins in Germany (http://www.zweitausendeins.de/ ) have a DVD with a large eBook-Library in different formats on sale, lot of German (and other Classics): http://www.zweitausendeins.de/redaktionelles/?thema=181208#B4
Authsider 
And yes, the Kindle can read PDFs, but will render them page by page which is in many cases impossible when you want to read longer stuff.
+1
A New tool has been launched called Kindle Writer
You can find out about it at http://www.kindlewriter.co.uk and download a 30 day free trial.
There are good reports about it.