Dear folks, On page http://www.de.debian.org/distrib/packages.en.html enter "gtk+extra17" in "Search package directories" form. You'll get no hit meanwhile THERE IS a package with this name. The same problem is with "task-c++-dev", and "gnotepad+-help", libdb2.6++-dbg but not with "crypt++el". However I guessed that character "+" is what confuses the search engine. Now is is me who is confused. :-)
Cheers Gabor