We'll have hot fix releases out every day this week, so fixes are coming out fast!
Now, on to setting up your own mirror in case you haven't done that already. With NGS you now have two choices:
A. Run a full copy of MusicBrainz on your servers. This will give you access to both the web interface and our web services API. This approach requires installing a lot of perl modules and it not recommended if all you need is access to the database itself.
B. Run only the database fed by the mbslave program. This will require you to install Postgres and this software only -- this is much faster than installing a full copy of MusicBrainz. mbslave will even support MySql database mirrors soon!
If you would like to try out the mbslave route, start here: . If you would like to go with the full MusicBrainz install, follow the instructions below:
1. Get a copy of the git version control program. See our Git wiki page for information on our Git workflow and links to learn more about git. 
This will warn you about being in a detached HEAD state; if you plan to make any changes to the codebase you should create another a branch as the warning message suggests:
> git checkout -b 2011-05-23-ngs-hotfixes
You can use any branch name you want, I just used the above as an example.
4. Once you have acquired the right code, its time to download the data from our FTP site.  For a mirror site you can skip the mbdump-edit file and if you dont need CD Stubs you can also skip the mbdump-cdstubs file.
5. Now read the INSTALL file in the source code and follow the instructions in it for setting up your own copy of MusicBrainz.
6. Once you've completed the setup, you can fetch updates using the usual replication command:
If you have any questions, please post them here or ask for help in our IRC channel at #musicbrainz-devel on irc.freenode.net.
> B. Run only the database fed by the mbslave program. This will
> require you to install Postgres and this software only -- this is
> much faster than installing a full copy of MusicBrainz. mbslave will
> even support MySql database mirrors soon!
> If you would like to try out the mbslave route, start here: .
It turns out this project has moved to github. Its new home is: