This is so cool. Always wanted to DIY presentable-things that related to my childhood when I was in secondary school, but all I managed to complete is PC modding of my old desktop.
Hmm, maybe next time when I'm free for this kind of hobbies.
We are the first generation forced to find a balance between letting technology improve our lives, or risk allowing it to dominate us.
Google says that the latest Gmail feature that allows you to make phone calls is only available in the US, but that's not true. If you set Gmail's interface language to English (US), you should see the "Call phone" option in the chat roster. You can also buy credit using Google Checkout.
If you're not in the US and you want to add credit to your account, make sure that you DON'T CLICK the "Upgrade your account" button from Google Voice. This feature is only useful if you are in the US, since it lets you get a Google Voice number. Unfortunately, if you click on that button and you're not in the US, you'll no longer be able to buy credit.