i am very new to wp, and looking for a solution for this problem. it’s really easy in other cms like joomla, but wordpress seems still to lack some features for creating non-blog sites. (at least this is my first impression)
anyway, i’ve found an article explaining how to create page specific sidebars in wordpress:
http://www.magneticwebworks.com/page-specific-sidebars-in-wordpress/
The other way is to get dirty and code some php, see conditional tags: http://codex.wordpress.org/Conditional_Tags
alternatively: there seems to be a plugin “Widget Logic”, that does something similar:
http://wordpress.org/extend/plugins/widget-logic/
hope that helps