Emerald released version 1.23.5.1101 in a normal and optimized version today.The downloads have been temporarily taken down. The new install was breaking voice. If you broke yours, install the voice pack from the previous install (950). They are fixing it and downloads will be back ‘soon’. UPDATE: New files went up about midnight SLT.
Viewers
General Viewer Information
Second Life Viewer: Imprudence 1.2 Review

There is a new Imprudence Viewer out, version 1.2. Massively’s Tateru Nino has a write up about it. They have itemized the new features and improvements, so I’ll skip repeating that.
The viewer has a User Interface (UI) that is a bit different than other viewers. Expect to take some time to get used to it.
Imprudence has added chat with vertical tabs, which I love. This change puts the tabs on the left side rather than bottom of the chat dialog. You can see many more tabs. It makes it much easier to keep up with ongoing IM’s. They don’t get scrolled off so easily.
Snowglobe Experimental Viewer Review Update

On November 18 a new release of the Snowglobe Viewer came out, 1-2-4-3007. On November 23 a new version of the bleeding edge beta Snowglobe Viewer was released, 1.3.0.3008. You can find the download links on this Second Life wiki page.
WARNING: Often new viewers crash more often than the previous version, not always. But often enough that one wants to keep a copy of the previous viewer in case one needs to rollback. Windows users can create a System Restore Point before installing a new viewer version for easy rollback. Linden Lab has a blog post on what to do if one keeps crashing. See: Keep Crashing
Emerald Viewer Fast Rez Tool
WARNING: See Massively article on Weird. 4/20/2010 – Emerald Viewer is dropping the feature that supports this tool. Soon it will no longer work.
This is an odd item… If you are using Emerald check it out. This add-on makes your Second Life world rez faster.
You can find it on XStreetSL (L$212) and in-world at DarkSim Deigns (L$200). There are several good reviews available on XStreetSL.
Another blog, Look What the Cat Brought, reviewed the tool. Lots of FAQ’s answered there. Read the positive review in Status Quome: Speed-Rezzing!
What is it and how does it work?
KirstenLee's S18-1 (214)
KirstenLee has updated her site with news of an updated viewer, (214).
This viewer gets better and better. I use it for most of my photos in SL now. I have not had time to use this one yet. I plan to use it this weekend. More later.
Greenlife Emerald Viewer Breasts Review
Update 12/2/2009
A new version 1101 was released Wednesday. See: Emerald Viewer Review – Update
12/3/09: I’ve added an index to all the Emerald Viewer Reviews. See: Emerald Viewer Review Index
Update 10/18/2009
The 1.23.5 (950) version has been released to handle the new LL updates. Greenlife Emerald Downloads 950
Second Life Blog Thread: Female Avatar complete. End of “bouncing-Prim-Business”?
Emerald Impostures Warning: [Emerald] Imposters!
11/6/09 – Emerald License Violations – Emerald goes after abusers
12/2/09 – Second Life Inventory Loss & Recovery
Linden Lab 3rd Party Viewer registration coming: Discussion: Third Party Viewer Policy
Massively covering the issue: Linden Lab to alter third-party Second Life viewer policies
10/24/09 – Modular Systems Response: [Emerald] Regarding ‘Third Party Viewer Policy Changes’
10/21/09 – JIRA Report: Import “Breast Physics” feature from Emerald Viewer – This is about having the feature added tot he standard Second Life Viewer.
11/23/09 – Speed Rezzer for Emerald Review
You may need to click MORE before these links will work.
10/21/09 – Added Vertical IM or Chat Tabs info.
10/21/09 – Added CryoLife Detection + 10/26/09
10/21/09 – Added Emerald Viewer Manual
10/23/09 – Added Emerald Attachment Points
10/24/09 – Added WARNING: Emerald Losing Shapes
Original Post
This week Modular Systems released version 1.23.4 (904). This version has lots of new features. One the guys will like is bouncy boobies. One everyone will appreciate is the client-side-AO. Read on. (Continued from GreenLife Emerald Viewer Review)
Emerald AO
AO’s or Animation Overrides are typically prims with animations and a control list that attaches to the viewer window as a HUD (heads up display). They control the walking, running, setting, jumping and other animations by overriding the default animations. The AO’s contain little computer programs (scripts) to run the animations. The scripts add to the sim server load. Now the Emerald team has added a client side AO. Skills Hak added this feature. Running the script client side means less load on sim servers and frees up a HUD slot. Plus it expands the number of animations you can load. Scripts in SL have a size limit. Plus Linden Lab (LL) is considering limiting scripts in some way like they limit prims (think tier).