Autostitch ([Only registered and activated users can see links. ]) has released a 64 Bit Demo Version of Autostitch which works really well and doesnt have the problems of the Win 32 bit version(Out of Memory Errors-for really Large Photos and if you have the memory set too high)
Both Photoshop couldnt do a photo,Microsoft Ice gave rough edges but Autostitch 64 bit did it easily without any problems. Great for Free and if it does what you want.
Read more: [Only registered and activated users can see links. ]