Using Amazon's own client libraries (or alternatives), you can get listings of available pre-packaged AMIs, but the interface is definitely designed for scriptability, not readability. Elasticfox is better, but still doesn't make it easy to see what an AMI does, allow for user rating, etc.
Is there a centralised place for me to easily find AMIs for specific purposes? AMIs for Apache, OpenMQ, MySQL, that sort of thing?