Thanks Karthik, but I must give credit to the tools I used:
PhotoShop CS for straightening 3 crooked source images
PanoTools and PTGui for stitching the panormama
PhotoShop CS for some fine tuning of colour and sharpness
Neat Image for noise reduction
I'm just the driver of these tools!
Oh, how could I forget, my Nikon 5700 camera for taking great source images!