Pilot Precise V5 Rollerball Pen, X-Fine Point, Black, Dozen at Staples®
http://www.staples.com/webapp/wcs/stores/servlet/StaplesProductDisplay?catalogId=10051&cmArea=SEARCH&langId=-1&productId=10528&storeId=10001&ts=1191273481003
"Innovative pigmented liquid-ink technology for exceptionally smooth writing" Always have one of these in my pocket along with a Moleskine
Pilot G-2 Retractable Gel-Ink Pens, Ultra Fine Point, Black, Dozen at Staples®
http://www.staples.com/webapp/wcs/stores/servlet/StaplesProductDisplay?catalogId=10051&cmArea=SEARCH&ddkey=StaplesZipCodeAdd&errorUrl=zipcode&jspStoreDir=Staples&langId=-1&prodCatType=0&productId=186980&storeId=10001&ts=1191273241317&zipCode=95051
"Smooth writing gel ink that's water resistant, check-safe and smear-proof" Never quite got into using these.