xnamag.de - a big german xna community:   

the xna creators' club - microsoft site with examples, a forum and educational stuff:

http://creators.xna.com/de-DE/

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I EAT YOU - amazing blog on german:

http://ieatyou.net/

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the rage effect - really crazy game programmer willing to share his experience! wuu haa :-)

http://www.rageeffect.com/

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spriteart.com - a very nice pixel art site:

http://www.spriteart.com/

the website of Kenneth Fejer - a really good pixel and low poly artist!