I noticed a problem with the caption boxes that WordPress creates, and the image box model around the images in posts.
adding this to styles.css:
.wp-caption {
padding-right:15px;
padding-left:5px;
}
will change this:

before fix
to this:

after fix
Let me know if anyone runs into any problems.
This doesn’t seem to work when I add an image as a thumbnail. I’ll look into that tomorrow.