I am using twentyten theme and I want there to be two sidebars on my page - one on the left and the second on the right.
Can any one tell me how to do that?
Thirty Ten is a child theme of Twenty Ten and could be excellent for you as it comes with 3 columns as you want.
There's more information about custom theme modification to add sidebars on another thread here
The link is potintig to the tutorial here which I found quite useful, that basically tells you to change functions.php so register_sidebars creates the number of sidebars you want