I've bought a LogiLink Bluetooth Wireless Slim Keyboard (ID0052). It works fine with my PlayBook except one thing: the keyboard has a german layout but the PlayBook interpets it as an english layout. This is a bit strange...
The language in the playbook is set to german, docs to go is german, keyboard is set to quertz... so it should work... should'nt it?
edit: or let's ask the other way around: where is the actual keyboard layout for HID stored on the playbook? maybe it's possible to manipulate this file.