How can I forward texts to my  tablet and reply back? I have a tablet running Android 4.0.1, and a cell phone running 2.2. 

When I'm working on my tablet, I would like to be able to see my texts and phone calls get forwarded to the tablet, which doesn't have a SIM card, and be able to interact with them as if I was on my cell phone, preferably over wi-fi and/or bluetooth. Is this possible? Paid solutions are acceptable as well.
If you're in the USA, use Google Voice - it allows a user to make voice calls while on WiFi and also allows sending / receiving SMS.

Also look at Tablet Talk for your SMS needs at least. In early development, there's also Phone Link

If you're working on your tablet, I believe the simplest solution for voice calls is to have a bluetooth handsfree paired with your phone so you can make and receive calls.