Post your improvements that you find with the Mac OS X 10.5.6 Update installed on your computer here. 
Mine:
Finder - Version 10.5.8, No matter whether Cover Flow has loaded all the previews, the scrolling is super smooth and quick.
iTunes - Graphic Improvements, same thing with Cover Flow and List View Scrolling + iTunes Store is better looking and scrolling has been smoothed.
Mail - Accepts Mail as soon as I get it (previously, I had to wait 8 or 12 hours).
iPhoto - No longer hangs when my iPhone is connected to my Mac and loads the photos in the background.
Safari - Around 1million X quicker than before. I am on 2 mb/s connection and Mac Rumors used to take a full 5 seconds to load and then the images would take another 7 seconds. That was without P2P activity.
So what improvements have you noticed?
allbrokeup
Mine:
Finder - Version 10.5.8, No matter whether Cover Flow has loaded all the previews, the scrolling is super smooth and quick.
iTunes - Graphic Improvements, same thing with Cover Flow and List View Scrolling + iTunes Store is better looking and scrolling has been smoothed.
Mail - Accepts Mail as soon as I get it (previously, I had to wait 8 or 12 hours).
iPhoto - No longer hangs when my iPhone is connected to my Mac and loads the photos in the background.
Safari - Around 1million X quicker than before. I am on 2 mb/s connection and Mac Rumors used to take a full 5 seconds to load and then the images would take another 7 seconds. That was without P2P activity.
So what improvements have you noticed?
allbrokeup