I'm not sure if the XEL-1 counts as "mass-production' really... It's more of a prototype they just started to sell... they are losing money on each unit they said, and only make about a thousand a month.
Samsung SDI still claim OLED TVs in 2009.
I think a really safe bet will be 2010-11 for large TVs in good price. We'll just have to wait a little more ;-)Ron