After looking at all the photos on www.ufocasebook.com/bestufopictures1 to 7, an interesting trend shows. The early photos, when photography was actually easy to manipulate (in spite of the web owner's comments) tended to be detailed and sharp, showing a lot of focus. As time trended, and the web owner has been good enough to time-list the photos, the photos moved into more light-emission and finally into principally fuzzy dots. While this trend is not as simple as that and I haven't run a statistical compilation, the trend from detailed UFO's to energy-emitting UFO's into fuzzy UFO's is pretty obvious.
If you ever wanted a quick look at a time span of UFO photo's and a pretty nice job of commenting, give http://www.ufocasebook.com/ a look.
Now, what would cause such an interesting trend, given that there are many more cameras with many more features and better lenses and film (or image capture methods, if you will). Well, better lenses might be an exaggeration given the new throw-away plastic lenses but in general better is appropriate. I believe the trend is caused by a move from faked photos to real photos. Of course a died-in-the-wool UFOlogist will say it's because the UFO operators have gotten cautious and more aware of cameras (probably a tool they never developed---puzzle that on out on your own) or because of changing technology of the UFO society, bringing better UFO vehicles to earth.
Is there a reason UFO's would be interested in Earth? Are we edible? Potentially a bio-crop? Was Douglas Adams right and we're an experimental computer and the rats are running the maze, not the scientists? Hmmmm. I don't see any reason for the UFO's "buzzing" the planet that is a good one. Mostly it seems they would help us stop the mess if they were friends. Since they are not giving us direct aid (and I don't see any sign of indirect aid, either) then they simply are not friends and can "bugger off."