I like the task bar very much. Is there a way to add a 'Show Desktop' icon to it? Windows 7 has it in the bottom right corner. I can't find it in the task bar properties. Thanks

Right click on Taskbar.
Select: Add New Quick Launch Item
At ItemType select: Internal Command
At Command select: Show Desktop
Click ok
Done

hmm cant it not be done on the bottom right corner like windows 7 i am quite used to it.

and one more thing the time and date option does not pop up calendar when clicked is there any way to bring that back ?

You can do it on the bottom right corner by creating a hotspot as follows:

Right click on Taskbar.
Select: Hotspots
Click: New

Make the following choices:
1. Run an Internal Command
2. Bumping Bottom Right Screen Corner
3. Whatever you would like
Press: Next
Select: Show Desktop
Press: Next
Make sure Enabled is checked.
Press Apply
Press OK.

Bumping bottom right corner with mouse will now activate show desktop. Bump it for the second time to let the windows reappear.

About the clock: Don't know of a way to let calendar (or two clocks) appear.