Just thought I'd put in another plug for Metatrader 5, which is the most active Metatrader 5 blog, hosted by miranon. The latest post Indicator Update for MT5 is up to his usual standard, and he has kindly pointed to some of my work on this blog as well.
*** update 20/11/2009 *** http://www.mql5.com/ is now active!
The Russian forum is bound to be as active as it was in mql4 and is quite readable with Google translate.
That's about it - if you google MQL5 or Metatrader 5 or MT5 you'll find lots of other sites such as Forex-TSD but although there are some interesting discussions, there's not much original MQL5 code. If anyone reading this has another site they'd like to highlight, feel free to post a comment.