Somehow, I've gathered 5 million friends who write YA. Not sure how I manage to not find so many people who write adult fantasy/mystery, but hey... that time will come.
Yes. Link. Ahem.
There's an agent looking for MG/YA submissions. Susanna Einstein of LJK Literary Management, and there's a lovely interview with her from the Guide to Literary Agents Series.
Here's a link to the interview. You can get to know her a bit before deciding if you want to query. :)