I use a program called PhotoStitch. It has a bit of a learning curve, as there are no real instructions provided, but it works well for the panoramic pics.
Photostitch is the only one so far - and from my use of it - isn't very good - my LG Dare took better stitched shots...which is too bad because that's a great feature to have
Vignette does not do panoramic. Andropan does not really stitch, it just connects pictures together without blending. Unfortunately photostitch is still the only viable option. I have sent a request in to the Vignette developers to add it to their app but nothing yet.