Skype phone for mac??

http://www.chat-cord.com/

I hooked a spare cordless to my PB and it works ok. They don't have a mac compatible dialer so you have to be at your computer to dial the call but after that you can wander around.

Got mine here:

http://store.voxilla.com/customer/product.php?productid=16137&cat=0&page=1

 

the following skype cordless phone works with MAC:

http://www.echostore.com/usb-cordless-phone.html

more skype phones or skype adapters:

http://www.echostore.com/skypemacstore.html