User content (objects), and expression cannot be saved in Second Life beyond storage in Linden Lab's inventory database. This is a large problem and it must be addressed now by the Open Source/Open Grid/Open Client Working Group and this community if it exists.
Please read the following blog posts for more on this subject and please comment and start a thread here.
Hi, JeanRicard - Have you been looking into the OpenGrid / OpenSim / Wonderland options? I think this driving the push that has Linden starting to correct this problem.