Nice rigs!
I too use a Samsung Galaxy S as source. HWZ doesn't allow me to link to my Picasa album though. =_=
Details:
Initially realized that the output wasn't powerful enough to drive my headphones properly, so I decided to build a CHA47 headphone amp and attach it to a SGS cellphone case.
Headphones are Sony MDR-V6 with Canare L-4E6S cables and Switchcraft connector.
Signal chain as follows:
SGS -> Canare L-2B2 interconnect cable with Neutrik plugs -> CHA47 Headphone amp with Burr Brown OPA2134 opamps and discrete rail splitter -> Sony MDR-V6.
Wish to get the Audio Technica ATH-M50 soon.