If you are looking to create a bit of userfriendliness for those out there using the A9 toolbar, Arne Brachhold has come along and made it into a WordPress plugin to make things easier for you.
SiteInfo is an open standard which allows you to specify information that will be displayed in a toolbar menu. This allows the A9 toolbar (or other toolbars that want to use SiteInfo) to display a menu about your site, when a user is on your site.
This plugin generates the SiteInfo information from the data of your WordPress blog. You can choose what you want to display at the SiteInfo WebMenu including Pages, Categories, Archives and Search.
Check it out at his site Home of Arne Brachhold.