With the release of WordPress 2.5 you don’t have to worry about the plugins I wrote.
I did a quick test and running WordPress 2.5 on my site I haven’t run in any problems with the plugins. If you do see any problems please report them on the AVH Support site.
I will be looking into the way the administration part of AVH Amazon looks. I’m not content with it and will change it in the future but this is a cosmetic change and doesn’t influence the way the plugin works.