A month or two ago someone mentioned to me that they left the WPMU Admin bar enabled because it gave users with multiple blogs links to the admin area of each their blogs. I personally don’t use the admin bar and turn it off on any of my blogs. On a client site I leave it enabled but still don’t use it.
Over the weekend it occurred to me that it shouldn’t be that hard to add those links to the New Post dropdown so that you would end up with something like this:

(Gotta love my original blog naming conventions
)
Anyway, you can download the plugin here: Blogs Menu Plugin (157) Note that the plugin does not add any links if the user only has one blog.
Love those blog names