So we're going all Google now? An extended beta with no end in sight?
Live Writer is rock solid and stable, not to mention nicely designed and fully-featured. The only reason it's not an official production version is because it's tied to the rest of the Live Wave, which is a bit silly.
I think regular version of WLWriter is also available, as is Tech Preview version.
I dont think it will be like Google , (or its product name itself is gmail beta?)
once wave3 testing phase is over, WLWriter will be provided with a regular stable ver. of Wave3 as was done for wave2.