JetBlue has had a number of interesting flight options over the years. My favorite was the unlimited flying option (titled All You Can Jet, iirc) announced a couple years back. The WSJ has a quick rundown of this year’s program plus some info about previous offers.
Now, JetBlue has announced Go Packs.
Wandering Aramean has some pretty cool diagrams of what the packages cover.
And, finally, the full description on JetBlue’s website.
While I think this is a good deal for business travelers, if you had free time on your hands (you have 90 days to fly 10 times) you could get a pretty reasonable value out of some cool trips, assuming you live in one of the base cities the packages are offered for.