MightyText is by far one of my favorite services/apps. This service allows me to send and receive texts on my PC. The functionality comes in great when I want to stay at my full PC keyboard, rather than physically picking up my cellphone.
The service installs an App on your smartphone(Android for now) . Then you install an app in the browser(Chrome, Firefox, IE and Safari), and boom ! Your set !
I have used this for tech support and archival purposes. Yes I now have a way of keeping my old text messages !