I habe have actually found out that it was not me that who started shooting windows (of course , duh... ), but now I am really enjoying it. Anyway it does not matter, today I discovered DCE Tools for Photoshop, and this was the first example of using it to correct barrel distortion. Of course not yet entirely. I was also pretty impressed about the Perspective Tool. Yes, everything they provide is already avaliable within PS but this one makes life one step easier.