Interesting that CP folks "told you" that they'd love you to develop a plugin... Given that when I posed questions about the xml stuff, I basically got pointed to developer docs -- rather than a "Hey, yeah, we'd LOVE to see a WP plugin developer, let us know if you need ANYTHING" sort of response.
I'd note that on the positive side, my two inquiries were answered both in under 24h, and were 'detailed enough', at least by the second response. :) Just again, if they'd really wanted a plugin, and I was talking about developing one, I'm a bit surprised my inquiries didn't invoke a stronger response (or further follow-ups! ;) ).
I did sign up as an affiliate, got my key, and did some quick tests. Basic structure would adapt well to CG-Amazon, though the response XML to my early queries seemed to be missing some data (like prices). I've since seen other example XML responses that showed prices embedded. Go figger.
Still planning on doing something within the CG-Amazon framework... But since my 'day job' (3D consulting) actually pays me money (shock!) and cranked from part time to full time, this obv got backburnered. Hoping it'll get ramped back up as I start to commit my weekends back to CHAITGEAR relaunch, and updated plugins. ;) The conceptual framework of CG-Amazon was ALWAYS meant to plug in other XML shop resources, so I'm just chomping at the bit to get it coded up. (Anyone wanting to be beta-testers, email me or contact me via my site -- likely weeks away, but lemme know... and lemme know if you'd be willing to either pay a one-time fee for this kind of thing, or prefer my CG-Amazon style "the CG affiliate code gets 20% of the links generated" licensing...).