I released sidebar editer plugin which make every user possible to choice/order/add contents of sidebar. I think this is very useful.
Here is copy from my entry( http://flapjack.chips.jp/blog/pp/2005/09/29/44/ ):
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Sidebar editor plugin for Word Press is now available.
I tested this on Word Press multi user edition and it works anyway. I think this plugin works also on normal Word Press.
Screenshot
http://flapjack.chips.jp/blog/pp/files/2005/09/screenshot-se.png
Features
» You can re-order your sidebar-contents
» You can add custom fields without editing sidebar.php. It means that you can add your profile, Bloglines, Flickr badge and anothe sidebar-contents very easily!
» You can make 2 sidebars: It is very useful if you want to have sidebars on both side.
» You can inactivate every contents of sidebar if you don’t want to show it.
» If you are WPMU user, every user can genelate their own sidebar!
Requirements
» Themes which have almost the same sidebar.php as Wordpress Default 1.5.
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I hope that you are interested in this plugin:)