The Second Life Notifications Viewer version 22.214.171.1245555 is now a release candidate (RC). This is the version that provides a new Notifications floater that separates incoming notifications into Categories. It provides, according to the Lab, a better way to view, interact with, prioritize and manage incoming notices for busy residents.
I haven’t tried this one yet. I am looking forward to it. Now that it is an RC version I may install it. I’ll wait a couple of days to see if it installs itself as I have use RC’s checked.