TPJ, (and anyone else). The feedback can be viewed from your profile page. You know, that big MY PROFILE button at the top of the window. Then looking below your avatar picture in the lower left you will see the word Feedback...
You can also reach this page by clicking on the feedback number that only you can see in the upper right corner of your posts.
Click on Feedback and you will see the full summary of your feedback with the number of feedback posts you have received and given. Below that is a link to every post that was ever given a thumbs up. By clicking on the link that says "username gave (##)" You can see the pages of post links to every post you "liked". This is useful if you want to bookmark posts that are of value to you. If you give away feedback indiscriminately, that page wont be much use to you.
This feedback can be made public or private with the settings we have, without causing a score or progress bar (medals) to appear in a post.