On Wednesday, July 8th, the Lab issued their notifications project viewer, which sees an overhaul of the way in which notifications – system, group, transaction, etc., are presented through the viewer.
The viewer has been in the works for a while, and is the direct request of a feature request put to the Lab by Aki Shichiroji back in 2012 (see BUG-8000), and which has more recently been working its way through the Lab’s work list to appear in project form on July 8th.
The release of the project viewer, version 3.8.1.303211, was accompanied by an official blog post on the subject, which reads in part:
The Notifications Project Viewer is an improvement for sorting your notifications. This new feature is based on your feedback: a notifications floater with four tabs sorting your incoming notifications into System, Transactions, Invitations, and Groups and allowing better interaction with them as well. Those who deal with high volumes of money transactions, group notices, group invites, or inventory transfers now have a better way to review their messages and identify which notices need immediate attention.
The images below show the floater and its four tabs:

Multiple notifications within a tab are initially shown compressed (above left). Clicking on the down pointing arrow button for a specific notification (highlighted in red, above left) will expand that particular notification within the floater (above right), with scroll bars allowing you to scroll down through an individual notification or through the notifications within that tab. Clicking the up point arrow button (highlighted in blue, above right) will compress an expanded notification.
As with the current notification system within the release viewer, individual notifications can be deleted from any tab by clicking the X button. There are also additional buttons within the panel for collapsing all expended notifications or deleting all notifications within the currently displayed tab (i.e. clicking Delete All with the System notifications tab will delete all notifications in that tab but not all of your notifications in general).
A further improvement to the way notifications are displayed is that a time stamp for when a notification was sent / received is now clearly visible, both in the collapsed and expanded views for all notifications. The presence of any attachment is also indicated by the use of a paper clip symbol.
Given this is a project viewer, the Lab is requesting feedback and bug reports via the Second Life JIRA.
A couple of issues have been filed already. One of these – BUG-9625 – points out that the notification floater currently fails to include any means of accepting a group invitation; the only way of accepting an invitation in the project viewer at present, is to click on the button displayed in the initial pop-up (which will still be displayed as usual). Expect this to be created in due course as the project viewer is updated.
Also, do keep in mind this is a project viewer, and currently not intended for prime time use.