SMSSend free SMS worldwide through Google talk
To know more about Chikka messenger, SMS rates, supported countries & mobile operators .etc. log on to www.chikka.com
Chikka Asia, Inc. is better known as creator of world's first instant messenger with integrated SMS feature. With 38 million registered users, Chikka messenger's fourth version release has got Google talk interoperability.
How to send SMS?
Add CountryCodeMobileNumber@chikkatalk.com (e.g. 91xxxxxxxxxx@chikkatalk.com for India) to your Gtalk contacts and send message. 
Chikka creates an unified account with this mobile number and recipient can retrieve the password either through SMS or at their site for future login.
Now, as per Chikka's policies, after 3 SMS are delivered recipient has to reply else further SMS will not be delivered. Though I have not tried, remove and re-add recipient's mobile number and check whether SMS are delivered or not. Recipient can reply either through SMS (paid) or logging into Chikka messenger (free).
Suggested reading:-
How to get SMS alerts for your email, orkut scraps .etc?
How to access Gtalk on your mobile phone?
Must have IM buddies for Gtalk:- IMified/ Anothr/ twitter
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