Here are some crappy pics i took of my hardwire job on my camera phone just a few minutes ago. I've been pleased with it so far, though i needed to change out my 6-disc in-dash for a sony headunit with an AUX input. At first i was hesitant to give up my 6-disc in dash, but i havent so much as played a complete song on a CD since i've got this hardwire.
This is the Belkin Tunebase (non-FM), with a flex-neck so i can position the base within arms reach and at a good visual level.
The 1/8" cable (blue wire) goes from the AUX input in the HU to the line in at the base of the TuneBase. The TB plugs into the car lighter for consistent charging of the 'pod.
The TuneBase (non-FM) is the one on the left
With iPod plugged in. Right now, i'm using a mini, but will probably upgrade when the next gen of photos come out -- hopefully by christmas.
Sorry for the low quality pics, but my camera phone was all i had handy. In total, the space this setup takes is about 6" x 3". Its not the cleanest setup in the world, but i'll worry about that when i upgrade to the big 'pod. for now, it looks good and sounds great.