What is difference between TAA and MSA?
From the FAA Chart User's Guide  


  Minimum Safe Altitude (MSA)
  
  MSAs are published for emergency use on IAP charts. MSAs appear in the
  planview of all IAPs except on approaches for which a Terminal Arrival
  Area (TAA) is used. The MSA is based on the primary NAVAID, waypoint,
  or airport reference point on which the IAP is predicated. The MSA
  depiction on the approach chart contains the identifier of the
  NAVAID/waypoint/ airport used to determine the MSA altitudes. MSAs are
  expressed in feet above mean sea level and normally have a 25 NM
  radius; however, this radius may be expanded to 30 NM if necessary to
  encompass the airport landing surfaces.  Ideally, a single sector
  altitude is established and depicted on the planview of approach
  charts; however, when necessary to obtain relief from obstructions,
  the area may be further sectored and as many as four MSAs established.
  When established, sectors may be no less than 90° in spread. MSAs
  provide 1,000 feet clearance over all obstructions but do not
  necessarily assure acceptable navigation signal coverage.  
  
  
  
  Terminal Arrival Areas (TAAs)
  
  The TAA icons will be positioned in the planview relative to their
  relationship to the procedure. The icon will not have feeder routes,
  airways, or radar vectors depicted. The TAA provides a transition from
  the enroute structure to the terminal environment with little required
  pilot/air traffic control interface for aircraft equipped with Area
  Navigation (RNAV) systems.  A standard TAA has three areas:
  straight-in, left base, and right base. The arc boundaries of the
  three areas of the TAA are published portions of the approach. A TAA
  provides minimum altitudes with standard obstacle clearance when
  operating within the TAA boundaries. TAAs are primarily used on RNAV
  approaches but may be used on an ILS approach when RNAV is the sole
  means for navigation to the IF; however, they are not normally used in
  areas of heavy concentration of air traffic.
  
  
  
  Non-standard TAAs may also be published; i.e., one base leg, no base
  legs.
  
  


To summarize:  

MSA's are referenced to a primary navaid, waypoint or airport reference point associated with the IAP. They show safe altitudes for a 360 degree area around the reference.   

TAA's are referenced relative to their relationship to the procedure.  Generally, that means one reference diagram for each IAF placed near the IAF depiction.