It is currently open for beta testing.
See the full ReachMahjong.com article ->there<-.
This online game is played with a client who runs on coffee (I mean Java).
It's light (few resource-consuming) and smooth.

Click on the banner to go to JoyJan's site.
Please post here your thoughts and suggestions.
PS: For registration, check if the mail to verify your email address ain't detected as spam, like gmail did for me.