I took the 'forums advice and went to Staples to buy a Fisher bullet pen (with pocket clip). Being a typical forum gadget freak I wandered around the store looking for something else to blow my already extended finances on, and guess what! I found something. There on a standing, revolving display up front was the "Micro Pen". It's made by Cross (always liked their pens). This pen is just big enough to hold a Croos cartridge but it is still retractable. Measurements: Length= 4 inches, diameter=0.18 inches(that's not a mistake). It does not have a pocket clip, but has a small plastic tab where the pocket clip would normally be. This tab gives you a grip so you can twist the body to extend the pen tip. The short metal sleeve that conceals the tip unscrews, but the cartridge doesn't feel like it can be removed and replaced. I didn't want take the chance of ruining it at the time. If this is true it is a major drawback, as the price ($12.98) doesn't justify its purchase. But if you need the smallest possible pen, this one might be worth it. As with all the Cross pens I've had It writes beautifully. You can see it at Cross' website. Oh! also the top end is a PDA stylus.
Mith.
Mith.