There is also this method:
Change the Softkey Buttons
Create the following keys and Strings in the registry:
HKEY_CURRENT_USER\Software\Microsoft\Today\Keys\11 2
HKEY_CURRENT_USER\Software\Microsoft\Today\Keys\11 3
112 is the left key and 113 is the right.
Now for each key create a new string named Open and set the target path.
Another popular option is also
WM5 NewMenu which gives quick acess to create new SMS, email, contacts, etc.