Answer my phone on my Tablet? I have an Android phone (HTC Desire Z), I also have a Android tablet (Acer Iconia Tab A501).  I would like to link up my phone to my tablet so I can answer my phone on my tablet.

Is this possible with Bluetooth?
Is this possible with any apps?
Is this possible with Call-Fowarding to a VOIP?

Not sure if there is anything else to try.
You can use your Google Voice number and receive calls at any computer.  The following snip comes from Google's web site for Google Voice:


  Make and receive calls in Gmail Google Voice lets you manage all your
  phone communications and seamlessly make and receive calls on any of
  your existing phones. But what if you don’t have your phone with you?
  Or what if you’re in a place with poor cell phone reception, or you’re
  travelling internationally and don’t want to incur expensive roaming
  charges? Wouldn’t it be great if you could use your computer to make
  or receive calls?
  
  Starting today you can use Gmail to receive or place Google Voice
  calls.
  
  To get started, check the box next to Google Chat in your list of
  forwarding phones and the next time someone calls your Google Voice
  number, Gmail will notify you of an incoming call. You can take the
  call or even listen in as the caller leaves a message, in a single
  step right from your computer


There you go, straight from the Google's mouth.

;-)