The new firestorm viewer and the SL viewer come what what is called Environments. This could be compared with windlight settings but is far more advanced.
There is a lot to say about this new feature but to keep it short it wont be long until you see use of it in many places in SL as these environments settings can be set by experiences (scripts).
If you want to know more about this feature check out the official wiki here: http://wiki.secondlife.com/wiki/Environmental_Enhancement_Project
As there is barly anything out there (scripts) for environments and because i got a request from one of my customers im working on a few “enviroment” scripts.
The first one you can find in my main store or marketplace here: https://marketplace.secondlife.com/p/Click-Environment-Changer/21925616