I'm seeing a lot of image spam, but the images are not individually spammy.
There are 5 tall, skinny images that together sell colon cleansing, or some
such.

Any ideas?

Spam scores quite low, so far.

Dan

Sample: http://www.visioncomm.net/5image.txt

Report:
X-Spam-Level: ***
X-Spam-Status: No, score=3.1 required=5.0 tests=BAYES_60=1,
HTML_IMAGE_RATIO_04=0.172,HTML_MESSAGE=0.001,URIBL _BLACK=1.955
autolearn=no
version=3.2.3