iTunes 9.1.1 - that's it. Many thanks for your hint!!! Now the Clamshell is nearly fully (back) in game and I have access to other iTunes-Libraries in our network now. (BTW great sight - the Graphite Clamshell sitting between Harman-Kardon Soundsticks and Subwoofer. - And I can't stop to praise the tiny 8$ EDIMAX EW-7811UN Wireless USB Adapter providing all the old Tiger&Leopard-PPC with nearly the latest WLAN-connectivity&security)iTunes 9.1.1 works on G3s with Tiger (unofficially - you'll probably need to download it manually rather than get it through Software Update), not sure if that helps or not though.
Attached with a new battery and mSata-SSD Mod the Clamshell's battery-menu-icon indicates music-streaming music for more than 6 hours.

I also upgraded to "WebKit for Tiger" which is provided from the people of Ten4Fox.
One last thing I'am looking for:
how to add graphics to a PDF-file (stamp&signatur as a transparent GIF)? "Skim" does offer great PDF-editing but unfortunately lacks the ability of adding picture-files. Would be a great add on for using the Clamshell as a fax-machine, with it's inbuilt modem and phone-jacket (with my iBookG4 I can use Acrobat8, which came with my Fujitsu m1500 scanner, but it's footprint seems to me to be too much for the clamshell. I didn't even give it a try...)
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