Inkscape power
Since I started to make games on my own, thanks to a close friend of mine, I have started to use inkscape.
I cannot say how much time I have won, prototyping all my apps in this super open & free software.
And if you want to try inkscape with a very good tutorial : go there : http://www.gamasutra.com/blogs/ChrisHildenbrand/20111015/8669/2D_Game_Art_for_Programmers__part_1.php
So here is my WIP using inkscape.

And the one on the main page of your site is broken as well.
But I had a look at the screenshots and I found it great.