This is a product that has nothing to do with PostgreSQL yet, so it does seem kind of odd that we are listing this in our product showcase section.
Well it is not even really a product per se, but I was just so enamored by the beauty of the layout and the usefulness of these cheat sheets, that I felt it was worthy of being listed in our showcase section since some of these would be useful to the PostgreSQL community of programmers.
What is this product you ask? It is DZone RefCardz. When I discovered this array of cheat sheets, I became a glutton and downloaded about 10 of them. It made me even want to start learning Ruby and also made me realize how little I know about CSS.
I was disappointed to find out that while they have an Essential MySQL, which by the way is extremely useful, they don't also have an Essential PostgreSQL yet. Someone should really write one of these things for PostgreSQL, but I guess it would be best for that someone to be a published author since it seems the main focus of RefCardz is as a publicity card for an author's book.
As a side note, it did get me thinking about the format of Postgres OnLine Journal cheat sheets and as many people have mentioned, perhaps we do try to cram too much information on one page. The layout of RefCardz cheat sheets seems to provide a good balance between amount of content and brevity and made me realize that having a multi-page cheat sheet is not such a bad thing. Their choice of colors, layout and diagrams is just mesmerizing.