I don't know if this is what you want but I'll give it to you anyway.
This file will give you placemarkers for the various feeds. I just found it on the internet
and it looks totally outdated; links don't work, missing feeds etc.
It's probably the same one you had/have.
KMZ file download:
http://bbs.keyhole.com/ubb/ubbthreads.php?ubb=download&Number=79405&filename=173857-LiveATCDataLayer.kmz
It's fairly simple to update.
On existing placemarkers:
1) Right click the placemark
2) On the menu, go to properties and left click
3) Update the links in the 'description field'
Note: Use keyboard 'copy and paste'. Control+C=copy Control+v=paste
I use the flash links. They have a standard format:
http://www.liveatc.net/flisten.php?mount=kmht - notice 'mount'= the airport icao in most cases
Creating a new placemarker:
1. Go to San Francisco area and left click on the placemarker icon in the top bar.
2. Move the placemarker to SFO airport area.
3. Follow the instructions that I gave you for updating placemarkers
Copy and paste the code below into the description field:
http://www.liveatc.net/flisten.php?mount=ksfo_clr<br>
San Francisco Clearance<br><br>
http://www.liveatc.net/flisten.php?mount=ksfo_gnd<br>
San Francisco Ground<br><br>
http://www.liveatc.net/flisten.php?mount=ksfo_twr<br>
San Francisco Tower<br><br>
http://www.liveatc.net/flisten.php?mount=ksfo_classb<br>
NORCAL Approach<br><br>
http://www.liveatc.net/flisten.php?mount=ksfo_dep<br>
NORCAL Departure
I think the next thing would be to get the frequency overlays incorporated into google earth.
If you are following a live flight, you would be able to see what frequency it would be going into
and act accordingly. I have only taken a cursory look at this so far. It's a fairly time consuming exercise
if you are a novice at google earth overlays like I am.