There's a key combination in the console view that used to display which channels were connected to a bus. I seem to recall it was simply Ctrl + Click. Is this the right combination or am I missing something?

Alt + Click on the Track Number.
 
Best,
Klaus

I couldn't find the recent post on this, and I had commented on, so tried looking through my old Posts.
 
Thanks Klaus
Alt + Click on the Bus Letter, and the tracks routed to it highlight (If you then CTRL + Click the bus letter to deselect the bus, the tracks remain highlighted and holding CTRL and dragging one of the track faders, moves all the faders feeding that bus)

I had no idea about this...how cool!  I think there is a list a mile long of cool stuff Sonar will do that I haven't stumbled across.

I think that feature has been there even pre X3 :)

Is there a way to quickly hide the tracks not connected to the selected bus?

I never knew this either! Like doncolga, I bet there's a *lot* more I don't know too.
And I've been using this since the first version of CWPA - (I think it was called CWPA 3). 

I personally take for granted how awesome Sonar is. More than once, I've seen "new" features in other DAWs and see that often those things are already in Sonar. Granted, that can go both ways, as there are some other really cool DAWs with great features out there, but I really love Sonar. This little tip on this thread will help me a lot. I've set alt+w to hide unselected tracks, so that will work great with buss connected tracks. I use alt+q to reveal all tracks.

Along the same line, since you can assign tracks to groups, is there a fast way to hide or reveal tracks based on the track grouping?

Thanks for your replies everyone! Looks like my momentary lapse of memory has helped a few of my colleagues learn something useful! Win! Win!  And yes I agree, Sonar rocks!

Noel Borthwick [Cakewalk]
I think that feature has been there even pre X3 :)

You'd have to ask Scook, Noel