http://www.lotro.com/

It's sort of a rial (rather than being free) but the fact you can get Turbine Points (the equivalent of real cash) for killing creatures kind of makes it free

Just thought I'd share this (from my experiences the community is more mature than WoW)

I still need to try the free LOTRO. It was only MMO I actually liked.

But http://www.gamesas.com/index.php?/topic/1117137-lord-of-the-rings-online-thread-2/

Yep, use that topic please.