Apparently, I missed the email that one of the sites I committed to went to public beta.
Why? Because Email sucks as a workflow tool! [Citation (not) needed]
Valiantly, SE sent me a followup email (Titled "Having trouble accessing XYZSite? - Area 51 - Stack Exchange"). Which I also missed, for a while.
Well, DVK, do you have anything constructive to say, or are you just whining here?
Proposal: when a site you committed to goes to private beta, it should send a notification about it in SE notification tool.
Specific tool could be Inbox, or Achievements list, or even a small banner on top of the site.
Small variations could be to add the sites you follow (not just commit) and public beta and not just private beta (or even full live status).
Side note: this should be in addition to email, not instead of it - because some people who commit on Area51 may not be active current SE users.