Second Life blender & some resources
Some info and resource about building in Second Life
There’s a good python script wich work with the current version of blender (also CVS) to builds prims offline without the need to be logged and use the second life client…
it’s called Prim dot Blender. Basically is the same internal editor but now you can work with blender 
It support many of the original client features (not the terrain) but it’s a good help.
To import in Second Life you need to use a SL script, you can read more about it here. From my test the first script give me an error so i have downloaded the second one (you’ll need to log in second life do take it) and imported successfully my first prims made with blender in the second life world.
To test your objects just search for Sandbox in the second life client, there’s many place where you can play and make build tests.
Useful resource to start building with Second Life
Textures
Template for cloth
helpful resource textures, 3d models, animation & more
Content & creation forum Area
Second Life Knowledge Base
Maya to Second Life Mel script
I hear about new scripts and tools to easily build prims in second life, but i don’t know if tis become public or source free
ciao