I am not super familiar with this, but I don't think you can use GTalk to send SMS to a regular phone number can you? With iMessage it's the same app as regular SMS on the iPhone, and it uses iMessage instead of SMS if both sides have it, otherwise it falls back to regular SMS, it's a seamless integration that many people aren't even aware of.
with google voice you can push it to sms, email or gvoice service accessible from phone or browser, and also falls back to sms if not using gvoice. With that being said I hope Google does unify gtalk and gvoice for a better experience between chat/sms/email
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I am not super familiar with this, but I don't think you can use GTalk to send SMS to a regular phone number can you? With iMessage it's the same app as regular SMS on the iPhone, and it uses iMessage instead of SMS if both sides have it, otherwise it falls back to regular SMS, it's a seamless integration that many people aren't even aware of.
with google voice you can push it to sms, email or gvoice service accessible from phone or browser, and also falls back to sms if not using gvoice. With that being said I hope Google does unify gtalk and gvoice for a better experience between chat/sms/email