In a multisite configuration, add a dropdown menu in administration to let you switch between sites admin.
Don't Work in WordPress MU. WordPress 3 only. Usefull only if you have a multisite install and if some users manages more than one blog.
This plugin adds a simple dropdown menu in administration header that allows you (and every site users) to switch between administration of every site they are member of (and so work for super-admin, admin, contributors,...).
Work best if the plugin is Network Activate.