This plugin gives every widget an extra control field called "Widget logic" that lets you control when the widget appears.
The text field lets you use WP's Conditional Tags, or any general PHP code.
There is also an option to add a wordpress 'widget_content' filter for you to tweak standard widgets to suit your theme.
0.42 - WP 2.5+ only now. WP's widget admin has changed so much and I was getting tied up in knots trying to make it work with them both.
0.4 - Brings WP 2.5 compatibility. I am trying to make it back compatible. If you have trouble using WL with WP 2.1--2.3 let me know the issue.
0.31 - Last WP 2.3 only version
Kjetil Flekkoy for reporting and helping to diagnose errors in the 0.4 version




