Following Eliezer's quasi-recommendation, I began reading "Prince of the Dark Kingdom"; 6 or 7 days later, I stumbled out having caught up on all 1.14M words.

I'm not entirely sure why I like it; the author's spelling, for example, hasn't improved over 5 years which is pretty irritating. I think what I like about it is that:

1. Voldemort seems like a much more developed and interesting character than pretty much anywhere else except MoR (much more so than the depicted version of Wizarding England which is basically a better-functioning sort of Nazi England).
2. the plot is totally different but at the same thing often very similar (I found how it pulled the Chamber of Secrets plotline very interesting)