txtDrop

Its goal is to make web based text messaging free and as easy as possible. Which is why they let you do everything in one easy step, on one simple webpage. Using our database driven technology, txtDrop enables users in the United States and Canada to send text messages with instant delivery. No more need to pay your cellular provider up to 10 cents for sending your friend a text. Just enter your name, your friends mobile number and your message and we'll send your text instantly. Completely free of charge.
There is txtDrop, a free service that you install as a widget on your computer so you can send text messages to your friends' cell phones, easily, and for free. This is great for people who go over their cell phone text message limits. Also your friends can reply to you and you can receive their text messages in your email.
More at: www.txtdrop.com