The first Mercedes I had with autosensing wipers I think was 2003. They may have introduced it a few years before that. The switch didn't really change, though. The first detent which used to be "slow" on older cars is now basically "auto".
And I don't remember exactly when we got 3-blink tap. The 2007 model I drive now does have it. I'm fairly certain my 2003 did also. And I know my 1994 did not. So somewhere in there.
Ok, on Audis it's a different setting that's why I asked. Thanks Todd, missed that. Here's to hoping we get the three blink tap. So far I've only seen german cars with them (then again, I've only driven American in Fords lately)