Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
Please see this thread for updates. Update Thread
SOH ADMINISTRATIONWorks the same in windows 7 also,thats what I use,it works good.I've been using 'Snapper' for a while now and quite like it.
http://www.michielovertoom.com/software/snapper/
Don't forget that FSX has it's own inbuilt screenshot tool too. Hit the 'V' key in flight and the screenshot is saved to your 'My Documents\My Pictures\Flight Simulator X Files' folder (in XP at least). The file is saved as a .bmp (better quality) and then you can open it in any photo editor and resave as .jpg if required.