Nice sandbox that has a lot of friendly helpful people. Sandbox cleans every 5 hours, so save your work often. This is a PG sand box, so stay dressed.

Plum Sandbox

Gallery of Reflexive Architecture: Keystone Bouchard

This is a place to wander around and look at the things that can be done on SL. Fly up about 601 M to see the most incredible work on the sim. *NOTE there may be a ride up, SL was lagged and I couldn’t find it, but hey, flying isn’t too bad. :)*

Check outThe Arch for more information.

“Want to learn particles? Hop on the balloon and ride up to the Particle Lab! New particle scripts, examples’n'explanations!”

This is a beautiful place and has everything you could ever want to know about particles, what they are, how they work, how to make them.

The Particle Laboratory.

“A Safe Place To Learn”
This is a great place to go to learn. Everything is on different levels and easy to find. There are also great tips on things like how to reduce lag, what to look at before you buy a parcel on a sim, and basic how to on sl.

This is what they offer:

Scripting, Building, Science & Music Tutorials / classes Beginner - Advanced Class Script Library

College of Scripting, Music and Science.