All Shall Love Me and Despair by MarcusRowland and others (West Wing crossover, post-series, includes spoilers for tWW S7)
     Illyria runs for president (includes spoilers for tWW S7). // It's a Round Robin, so there are additional chapters by various authors (6 chapters, 5 authors, as of Dec. 21, 2007).

Grandmother's House by Doyle (Illyria, Buffy; PG-13; post-NFA; 668 words)
     I'm such a sucker for mythos, and this has really interesting speculation about a connection between the Slayers and the Old Ones.

And that mutual grooming thing that chimps do? Also good. If you see typos, broken links, or anything else that needs fixing on this site, please let me know. And always feel free to recommend me fanfic, books, whatever.