Actually, this was built a couple months ago, but...here's my Objective2 (O2) headphone amplifier. It's a pretty easy build as there's no wires to route. It's just place and solder. At one point I had issues, probably resulting from carelessly letting desoldering braid filled up with solder shorting out some of the power supply capacitors (holding like 18V) while I was touching up a few solder joints. It works fine now though.
Cell phone pics without the best lighting, so quality is not so great, but you can see what's going on.
For the sharp-eyed, a couple notes: (1) the four capacitors on the left are part of the power supply and are supposed to be the same, but I had spares and used two different types but with the same specs, (2) yes I mounted the board upside down in the enclosure and am not using a front panel, (3) R17 and R21 are indeed left blank intentionally to have 1x (no) gain on the low gain setting. High gain I set to 5.1x. Uh, also, (4) my soldering and parts placement sucks.
Ports from left to right are AC power input, on/off switch, headphone stereo output (3.5mm), (LED), volume knob (potentiometer), gain switch, stereo input (3.5mm), for reference.Edited by mikeaj - 12/21/11 at 11:24pm