To install:

    $ git clone git://github.com/carlor/dlang-workspace.git dlang
    $ cd dlang/
    $ git clone <dmd,      the central repo or your fork>
    $ git clone <druntime, the central repo or your fork>
    $ git clone <phobos,   the central repo or your fork>

Now, you can run the `posix/gen.sh` script to build all repositories. You can
specify what item specifically to build (`dmd`, `phobos`, or `druntime`) as a
parameter to `gen.sh`.

It makes an executable which links to your fork of druntime/phobos called `wbd`.
You guess the acronym (hint: MRI)

Works like a charm here! (Kubuntu). You code builds dmd and the rest flawlessly and the resulting executable works OK. Great! Building and rebuilding was exactly what stopped me from using the lastest DMD.
Now, I can test my projects with both 2.060 and the latest git HEAD. 

Eh, compilation is 10% faster with 2.061 than with 2.060! And all unit tests pass, woo hoo!

Thanks a lot Nathan!