I got a chance to write a spider for buch.de. I think it's working correctly based on my "incredible" German language skills (aka Babefish). I did have to do a little something weird on this one. Apparently Xlobby sends 2 seperate http get request when spidering, the first does not include the %searchstring% variable, I'm guessing Xlobby uses this to verify the site is available before sending a second get request with the %searchstring% included. Buch.de returns a 404 error if you don't have a value for the search instead of the typicall HTTP 200/OK message. This causes Xlobby not to send the second request, bummer. I figured out that I could include a default "1" in the search and Buch.de would respond correctly to the first query and it doesn't seem to mess up the search in the testing I've done - of course I'm sure it will screw some search (ie searching for 10 - Bo Derek movie would probably get you 101 Dalmations instead...).
I've put the two German spiders in a single zip...
http://home.comcast.net/~twhite644/spid ... German.zip
good luck,
tsw