DeskSMS is an app which enables you to reply to your text messages without even touching your phone. It pushes to your text messages to GTalk or GMail or even both if you like. You can reply from within those apps without having to type out the message on your device.
I love how I can type out messages a lot quicker with my full size keyboard on my computer instead of using the phone screen. It makes typing messages out a lot quicker. It also means I can leave my phone docked, without having to keep picking it up to reply to my messages.
So far it is working great for me however it is in BETA stage at the moment so you may find bugs.