There will be a read-only version of Yojimbo for the iPad, which requires Yojimbo 3 on the Macintosh.
From
http://www.barebones.com/store/yojimbo_free_eligible.htmlYojimbo 3 Free Upgrade
All registered customers with Yojimbo 2 are eligible to receive an upgrade to Yojimbo 3 free of charge.
Customers who purchased Yojimbo directly from Bare Bones Software will receive new license information via email within the next 10-15 business days.
(If after that time, you have not yet received an email notification, and you purchased Yojimbo directly from Bare Bones Software, please contact our Sales Department for assistance.)