I put together a simple Growl listener application. Growl is a network notification system for Mac OS X. See http://growl.info for more information. In its current form it will listen for an application named "CID" for caller ID. The caller ID name and number (or whatever is sent in the CID notification) will be displayed in the lower right corner of the TV. I use growlnotify to send my caller ID info via AppleScript.
This is alpha quality code right now but it does provide some basic functionality. It can be downloaded at
Feedback and bug reports welcome.