ET is known for Quality? There is very little quantity or quality in the forex section of ET. If I have missed this elusive quality, please feel free to show me the error of my ways.
ET Oanda Forexfactory - especially the FX calendar These are my top 3 - ET has quality which is what has killed Moneytec & StrategyFX (I was a long time contributor) - they went very commercial (the adds in your face drive me spare) and compromised themselves. Billf..
ForexFactory has a news trading room - I have not seen it other places. http://www.forexfactory.com/forexforum/forumdisplay.php?f=73
I found another interesting forum which discusses non dealing desk brokers: http://nondealingdesk.com/
I use ET and moneytec. I find that ET is generally more useful. Quality of any internet message board isn't going to be exceptional. Just take a look at yahoo boards for equity if you want to see poor quality. As far as quality of posts, I'm not too sure there's a lot of topics to discuss about FX. I find that FX is pure compared to the chatter of equities. I also find that most serious FX traders are mature and don't really seek others' opinions like the new guys that step into stocks all the time.
Elitetrader has done a great job with its forums as far as quality goes! I have met some very bright people on these boards, and I think I will be here for a very long time