And you have been visiting! Currently MakeYourWallpaper has grown to 8000 visitors a month. Well the best wishes for all of you in 2013, and do not hesitate to send me some comments or feature requests. And of course feel welcome to make some wallpapers!
The immense resolution of the retina macbook pro (2880 x 1800) is now supported. The exported png's are indeed on the large size about 4mb. My laptop ( with 1/4 of the retina screen estate 😐 ) experiences some performance drops, hence the resolution only fits on the fastest macbook, which should handle it just fine.