Using intel Intel Core Duo, OS 10.4.11.
Sherlock always opens in the window 'Sherlock -(null)'
Clicking on they channel icon (upper left corner) populates the collections list with:
Toolbar
Channels Menu
Apple
Other Channels
My Channels
Clicking on, say, Apple, brings up a list. Click on any listed item momentarily displays a 'Loading (Null)' box, then nothing. The tool bar still remains across the top of the window.
I don't know if anyone uses Sherlock anymore, and don't know why it's still there. Big deal, years ago.
Just checked - yup, it's gone from Leopard. I seem to recall it worked in Tiger, but had no particular use. You can essentially set up channels in Safari and in start pages like Yahoo.
Good luck!