TakAlign allows you to easily polar align your Takahashi P2-Z, EM-10, NJP or EM-500 mount.  It shows a representations of the Takahashi polar scope reticle with the alignment star shown in its correct position given your time and longitude.  The application can be configured to align either on Polaris in the northern hemisphere or Sigma Octantis in the southern hemisphere.  The display updates the position every second, ensuring accurate polar alignment.  English language only, compatible with iPhone and iPod touch.
TakAlign Website                       
TakAlign on iTunes