If you read my previous post on the importance of sketching your code, then you know that I'm a huge fan of getting ideas out on pen and paper first before attempting to code them up. And in order to make this happen, you will need, a Pen. Many people use whatever they can find as they rummage through their desk, normally a generic off-brand pen that's somewhat rough to write with. You get this pressure that it tends to generate where one has to almost drive the pen through the page in order to get their thoughts out.
So having a pen that is resilient and that will la