We pushed out Miro 3.0.1 a couple of days ago to address a few problems that we discovered with 3.0. If you haven't upgraded to 3.0.1 yet, it's definitely worth doing.
Release notes for Miro 3.0.1 are here.
The other big change with this release is that I've moved our Ubuntu packages from repositories on OSUOSL to our miro-releases Launchpad PPA.
As of 3.0.1, we're no longer pushing packages to our repositories on OSUOSL.
Details on the miro-releases PPA are at here.
I do plan on doing packages for Lucid, but there's a problem with
Miro's embedded XULRunner browser on Lucid. It's captured
13169. Ben and I are working on it, but if you've got
experience with XULRunner, GTK, and/or gtkmozembed, we could use
some help. Details and status of the problem are in the bug. This
bug is definitely blocking packages for Lucid. If you can help,
ping us on
#miro-hackers on freenode.net.
Update 4/22/2010: Lucid packages are in the PPA, too.