Great, thanks for posting back with a solution!
I had just downloaded Lightning 0.8 today as well as I wanted to use the 2-way sync Google Calendar extension Provider. The Tasks icon did not automatically appear for me, but I just opened the Mode toolbar and added it. Nice!
They also changed the key combo to make the Events/Tasks sidebar appear when you are in the Mail window. It was Cntl+D, now function key F11 opens the sidebar.
Thanks again dnmint for posting back about the Task icon......much appreciated.