In XP and Vista you only see the compatibility mode tab when right clicking while this creates new registry entries to set the mode even if you don't run the installer on the spot. It's also good for troubleshooting when you get something on ok but it simply won't run as it should.
With the older quick launch bar option you had a limited amount of space to drag the tab across each time a new icon was added there. With 7's taskbar you simply unlock the bar in the right click properties and have the entire bar upto the notification area to use for anything you pin onto it.
The interesting they did there was add that as well as the pin to start menu option to the right click menu right below the troubleshooter. easy to find, easy to use.