Got this rec from another page (thanks, Liz) and decided to read it, even though the title would ordinarily have kept me away. I was surprised and delighted by what a well-written, solidly characterized, witty, touching and intriguing story I found. So here it is:
Harry Potter and the Polka Dot Plague by Marina Frants.
Read. Enjoy. Review.
In other good news, the same multi-fandom fic rec page also chose to recommend the excellent, novel-length Tom Riddle fic by D&L beta-readers turned virtuoso authors Alec and Teri -- The Arithmancer's Apprentice. I hope this means that many, many more people will read the story and give it the recognition it deserves. And yes, This Means You. :)
And now I'm off to hopefully not make a disaster of myself on stage. More later.