The hallmark feature of 3.0 is sync support for the brand new Yojimbo iPad app. The Desktop version syncs to the iPad version over a local Wi-Fi network. Alas, the notes and items on your iPad will be read only, and it does not sync over the air. But it’s a good looking, easy-to-use repository of your Yojimbo information right on your iPad.
The 3.0 upgrade is free if you already own 2.x — Bare Bones will send you a free 3.0 license seat in the next several days, and in the mean time you can just download the 3.0 demo. The iPad app is $10 in the iTunes store.