I'll report back with version numbers soon.
Update: Well, whenever it decides to download. My Cr-48 hung on "downloading update" twice, then "Failed". Since then, I've seen reports about others getting their updates, but not mine. There doesn't appear to be a way to force an update.
In any case, I ask simply:
Finally got it.
Chrome OS 0.10.146.1 (Official Build 2a517638) dev x86-mario
Google Chrome 10.0.642.2