I got a notice yesterday about Mono in Second Life.  No, I did not have to rush to my doctors.  This all about SL script improvement - or we all hope it is.  From Linden Lab:

I’m delighted to announce that Mono is ready to launch as part of the 1.24 Server deploy starting today.

Mono is an open source technology that improves the stability and speed of scripts – particularly calculation-intensive ones. In some of the internal benchmarking we’ve done, scripts running on Mono ran up to 220 times faster. This extra speed both increases the gamut of scripted applications that can be developed in Second Life and also makes Second Life more responsive when running existing scripted applications that have been converted to run on the Mono scripting engine.

Read the entire entry here: Link (Source:  Linden Lab blog)

Now remember:

Because Mono has been integrated in to Second Life alongside the original scripting engine, scripters are able to opt in to Mono. Unless scripts are explicitly converted to run on Mono they will continue to run on the existing scripting engine.