So, I don't yet have anything worth writing home about on the Centro's Blazer browser. But, besides discovering that there's next to no documentation on the web for it, I've figured out a few things. Mainly, it seems to be firmly rooted in an era of capabilities not entirely dissimilar to Netscape 4. Constraining and limited and buggy, though not entirely a stupid browser.
The main limitation to something resembling modern techniques is that while it seems like DOM traversal exists and I can modify attributes and node values - all the methods for creating, inserting, or removing nodes appear to be no-ops. So, I can declare nodes in an HTML document, but thereafter never dynamically create or destroy nodes.
I'm at a stage now where I'm trying to decide if this mess is worth playing with further, and if I can think of anything interesting to build.