I came across Voicethread today while looking over my tech blogs. It allows people to upload pictures and add audio commentary on them. It is similar to Bubbleshare but it allows for feedback from blog readers. Unfortunately, it does require people to register, which is free. Here is an example:
Here is the link to the website. Be sure to check out the tutorial that the site has made to help newbs. The username and password are what we always use.