Laridian has released two very exciting books for PocketBible. The first is the
Complete Jewish Bible and the companion product is the
Jewish New Testament Commentary. You should read up on both products on Laridian's site to see if they interest you. I have found both to be very interesting and helpful.
The Complete Jewish Bible is roughly 3.3MB and the Jewish New Testament Commentary is 2.0MB. Both are $14.99. Note that if you already have PocketBible, you will need to upgrade to the latest version, which should be in the "Update" area of your download account at Laridian.