I just released the xmlrpcclient plugin.
For now, It has only the ability to search in other elgg sites (servers) and give the results back while the user searches some tags on your elgg platform (client).
This plugin is written globaly, so that other client requests can also be implemented and added to it.
Keywords: elgg, plugin, remote search, xmlrpc client

Comments
It looks greate! I will try it. It would help me on a personal project that I had.
Thanks for you contribution!