Backlinks for images
Only just noticed that yahoo site explorer will show you backlinks for images. Guess i missed this one when reading seo for dummies.
Was looking to see what i would have to do to make this image of DougS 
rank for doug scott (better file name would help) and noticed yahoo was showing which pages referenced the image.
Anyway i guess this has a few amusing and practical uses, tracking pixels ;).
Take a look at who uses Googles logo
