Several folks have asked about my new portable air compressor. It is a Master Flow MF-1050:
I got mine a Poway Costco for $47; Amazon also has them for $52:
http://www.amazon.com/Master-Flow-MF-1050-Portable-Compressor/dp/B000L9AD2U/ref=sr_1_4?ie=UTF8&s=automotive&qid=1209847625&sr=1-4
I love this compressor. It will add 5 psi in about a minute, runs off the battery, is compact, and comes with a carrying case. It is much more functional than the air bottle I used to carry.