Send free sms worldwide using e-freesms.com
This is a quick, easy free sms text messaging site to use. Claims to offer 100% free, unlimited, 160 characters SMS to over 200+ countries worldwide.
No need for registration, which is great. And the service runs from multiple servers, which basically means that it is not likely to go down (there is a Facebook feed of users, which reveal how well the service is running in real-time)
Registration required, etc:
Registration required? No
Receive messages? No
Confirmed delivery of messages? No
Message length? 160
Message Quota? Unlimited sms daily