Great shot Martin - in fact, it had so much detail that I couldn't resist a re-work attempt. I reduced the star size and halos a little in Imagesplus, and then performed a shadow/highlight adjustment in CS3. Reduced in size to 1260px the clarity is starting to show - especially around the keyhole. The basic data is there in spades, and a tweak or two really brings it up.
http://www.omaroo.com/gallery2/main....serialNumber=1
Excellent work mate.