If you've gone looking for the Emerald SL client lately, you've probably found it somewhat frustrating. They've moved, but the old links still show up at the top of Google searches.
So, to save those who read here the trouble, and, I hope, to move the current link further up the heap, here's where to go for Emerald, or at least, so it seems. I'm a bit puzzled, as the Linux download there is 18.104.22.1685, but OTOH, in the directory where I keep the various SL clients I've fetched, I see a 22.214.171.1244 that I fetched last Saturday, and I don't recall where I retrieved it from.
UPDATE: Thanks to Nalates; by all means take the advice from the comment, and head for http://blog.modularsystems.sl/.