We ended up having to duplicate some of the functionality of Raphael ourselves while writing the processing mentioned in the article (like to locate regions of an uploaded image after transformation). We thought it was best to just use this code to do the layout as well. It also ended up being a lot smaller than a full library, since we're not using a ton of features.

That said we played around with Snapsvg, and it is great if you're lucky like us and don't have to support IE6.