Wunderbar!

*Jquery_update 2.x-dev is required for it to function 100% in Drupal 6. 7 release just works :)

Features:
*Configurable bar w/ set buttons and ability to link off to social networking sites
*Integration with cookies plugin
*Integration with easing plugin
*More visible login / logout area
*Optional integration with the print and search modules (as well as webaccess / activation_codes but those aren't on d.o.)
*Permission to dictate who can view the bar

The Wunderbar! is a floating bar that was recently implemented on http://elearning.psu.edu/ This project is marked alpha because of browser support. Compatibility has been documented in the http://drupalcode.org/viewvc/drupal/contributions/modules/wunderbar/READ... file but it's working correctly in most major browsers except IE (V 0.6 and higher now works in IE8!). If this can be made to work in IE7 then I'll mark it a full release.

It has all the icons shown in the drupalcamp montreal presentation Extreme Navigation Tactics but some have module requirements that are internal to Penn State. The AIM status button hasn't been implemented.

If you want position remembering and better animation support you'll need to download these two plugins and put them in the wunderbar/js folder.
jQuery Cookies - http://plugins.jquery.com/files/jquery.cookie.js.txt
jQuery Easing - http://gsgd.co.uk/sandbox/jquery/easing/jquery.easing.1.3.js

The project will run fine without them but works as intended when they are installed. If you want something more expandable / flexible, try http://drupal.org/project/appbar