Riche101
Android Enthusiast
I'm sure there are other ways and apps but it works a treat for me 
Top Gear app
https://market.android.com/details?id=blah.im.textreader2&feature=search_result
It reads out any incoming txts and you can reply by voice
And use a good Jabra Visor Kit (Any would do)
Now when driving I can get and make calls get txts read out to me and I can voice dictate replies etc

Top Gear app
https://market.android.com/details?id=blah.im.textreader2&feature=search_result
It reads out any incoming txts and you can reply by voice
And use a good Jabra Visor Kit (Any would do)
Now when driving I can get and make calls get txts read out to me and I can voice dictate replies etc