This critically important threat to privacy has been previously diaried here and here.
The Department of Homeland Security and the California Department of Motor Vehicles are having a Town Hall Meeting to seek public feedback at UC Davis tomorrow, May 1 (10 a.m. - 2 p.m. PDT) -- and it's being webcast! The site says you can submit email questions starting 90 minutes before the webcast; this is a great chance to ask the hard questions -- and hear what they have to say.
If you want to file comments, EFF, PrivacyActivism and the ACLU all have instruction pages up and the deadline is May 8.
They're blogging about Real ID on the Stop Real ID Now! blog and will report what happens -- as well as all the other things going on...
I apologize for the limited diary and short notice but this is too important an issue to be left to chance.