Some notes:

Amazon Associate Filter – nothing happens

Amazon Book Picture from ASIN – just creates images from ASIN , uses shortcodes

Amazon Carousel(*) – flash, uses shortcodes, cool, lots of options, easy to use

Amazon Context Links Ads – does nothing

Amazon Machine Tags – complicated, uses shortcodes, requires an AWS key

Amazon MP3 Clips widget(*) – cool, flash 9.0.45 or above required, shortcodes, lots of options

Amazon Niche Store(*) – shortcodes, lots of options, 10% of the time is plugin author’s Amazon affiliate ID, plugin author linkback, widget included

Amazon Product Ads(*) – widget only, displays 1 item only, self-optimizing (auto) setting

Amazon Reloaded for WordPress – adds setting to post page but ajax not working

Amazon Search – not working, error: MissingParameter / Signature, widget and shortcode links only

Amazon Showcase – Access Identifiers required (AWS keys?)

AmazonSimpleAdmin – Access Identifiers required (AWS keys?)

Amazon SmartLinks Widget – many widget, working pretty well, looks nice

Amazon Widgets Shortcodes(*) – cool, lots of shortcodes, adds section to post page, conflicts with Amazon Niche Store plugin resulting in no output, must know exact widget ID

Keral Patel Amazon Wordpress Plugin – requires an amazon web services access key

(*) i liked, but needs further testing