Anyone who knows a fic where Harry actually makes a Horcrux (excluding the one in the 'Work By Authors' forum here)

Sadly there seems to be few if any of those, which sucks since I can definately see the potential for such fics

 

I assume you're referring to Derulo's story Horcruxes, when you mean the one story that is in the WbA. If not then give it a try, it is quite good, though there is only two chapters as of yet.

Other than that, there is a one-shot by The Catiff, which I remember to be pretty good. I've read a few stories with Harry making a Horcrux but none of them were good, even remotely. Derulo's fic is the sole exception.