In reply to Peter Lancashire.

There is a visual gallery that has been around for years. You can find it by searching for "sas graphics gallery". Click the "PROC SGPLOT" link for an example of modern ODS graphics. Each graph links to code that generates it.

I think there is room for both approaches (gallery and blog). In particular:
1) As this blog post shows, you can combine plots. Thus "comprehensive" is difficult to achieve due to the combinatorial explosion of possibilities.
2) Context matters. In my blog posts, I focus on statistical analysis of data, sometimes using real-world data. I am willing to download interesting data, explain it, and describe why a particular graph works to visualize it. In a gallery, the examples are necessarily more simple and are designed to require minimal background or explanation. People read my blog to see how to use SAS software to solve interesting problems.

By the way, Sanjay Matange created a graphics gallery of his blog posts, which I think is really cool.