Not sure how this stacks up to the rest of the big boys yet, but we talked to some folks at SunRocket the other day and they told us about their $199 unlimited yearly calling plan with 30 minutes international calling and all kinds of E911 hotness. Plus, there's no cancellation fee. If you're already using Sun Rocket, go ahead and tell us about it, but it seems like a good deal. However, they call their hardware the "SunRocket Gizmo" which makes them deserve unceasing excoriation.
Product Page [SunRocket]