One we like concerns Bavaria--in English. Great info there and a nice looking site on top of everything. Done by Angelo Biviano. If you're traveling to Bavaria and have the ambitiion toi fish, look into this site. Some good links, too.
Last but not least, "Fliegenfischer Forum" is one we like because it is very informative. Even if you don't plan to travel to Germany, you can pick up something useful from these sites.