I have just posted two new projects, both air compressor related.
The first is a mini portable 12V air compressor that I built for blowing out computers and other electronic devices. I needed a source of air I could carry around in my day to day job as an on-site computer tech. Those cans of "air" suck, so a small compressor was the solution. Read all about it and watch a demo video at http://www.aaroncake.net/projects/12vminicompressor.htm
The second compressor project is an upgrade to my shop compressor. I took the small 5 CFM oil-less pump from my Campbell Hausfeld model WL660301AJ compressor and replaced it with a 14 CFM two cylinder pump driven by a 5 HP motor on a custom mounting base. The project writeup and video is at http://www.aaroncake.net/projects/chcompressorupgrade.htm