Skype-Gizmo comparison:

The audio quality is about the same, but:

- Gizmo has Video Chat to PC (you have to use Gizmo client on tablet and beta Gizmo client on PC)
- Gizmo, as mentioned above, works with GrandCentral to make free landline calls (if the planets are in alignment, and weather permits)
- Skype gets through (almost) every firewall / router / proxy / whatever, and everyone and their dog seems to have Skype.