This is just a note to self, to make things easier when updating to a new build in the future. What I needed to do to get my Pi running correctly with Milhouse build 503:
First mount flash partition read/write:
mount -o rw,remount /flash
In /flash/config.txt:
gpu_mem=192
arm_freq=900
core_freq=333
sdram_freq=450
over_voltage=2
force_turbo=1
In /flash/cmdline.txt, add noram.
In Settings, System, enable advanced, then select ALSA USB DAC audio, enable passthrough, and DTS capable receiver.
In ~/.xbmc/userdata/advancedsettings.xml:
<advancedsettings>
<video>
<defaultdvdplayer>dvdplayer</defaultdvdplayer>
<defaultplayer>dvdplayer</defaultplayer>
</video>
<network>
<buffermode>1</buffermode>
</network>
</advancedsettings>