Mike, a frequent commenter and long-time reader, just put together a great "ink-fight" post. Mike sets up the battle by explaining the differences between an active digitizer and a passive digitizer on a tablet. Armed with the information, he then shows several examples of the differences by inking the same items on a Lenovo X41 (active) and a Samsung Q1 (passive).
I personally find the Q1 ink experience more than adequate for my needs, however, everyone has different needs, so you should carefully consider your inking requirements before purchasing any Tablet PC. Don’t forget that there are numerous text input methods available on Tablets and UMPCs as well. Great post Mike; hope we see many more like it!