I just ran YSlow on my site and this shows up under ETag:
http://content.clicklifter.com/Learning/learn.js
I have no idea what it is or how to get rid of it and I can't find any info about this anywhere.
Can someone at least tell me how I can get rid of it if I do not see it in my view source but it shows up in YSlow under "configure entity tags"?
Most likely this script is being brought in by another script or an ad on your site. If that's the case, you won't see it in view source, but tools like YSlow will reveal it.