*thinks*
Eh, apart from the aforementioned lemon, I don't believe there's anything else, at least not on the sites I frequent (which pretty much amounts to here and FF.Net), and a quick search through FF.Net revealed only two stories where Rider is even a main character, those being F1's story and a puke-inducing (though quite well written, IIRC) Shinji/Rider rape oneshot.
I suppose there might be some jewels hidden in the rough, if one were to search the section manually, but right now I really don't have the strength to wade through the enormous pile of OC-fests and Rin/Archer fics for the slim hope of finding something good.