It's not so much a DIY but I modded a Speck See-thru case so I don't ever have to take it off because there's no hinderance to the docking area. I made it flat up to the iPod's surface. It's the best case hands down that I've ever had since my 5G video and an Agent18 case.
thoguht up of another idea... i dont think ive seen "these" anywhere before... its quite silly. acutally. if anything good comes out of it. ill post up pics as usual