Edit: I wanted people to realize that they only need to write the question title, and not the question body itself.
The Mathematical Modeling SE proposal (http://area51.stackexchange.com/proposals/57490/mathematical-modeling) recently passed a benchmark by reaching the required number of followers.
Unfortunately, very few sample questions have been asked. If you would like a place to direct people with good applied questions that are not on topic here, please consider contributing a few questions and voting on current questions. It requires no commitment.
EDIT: The way Area51 works is that you just write down 5 questions that you think belong on the proposed site (just follow the link to see). Noone answers them; instead, you get 5 votes to decide which of the other questions you would enjoy the most.
Please share any questions you can. Several people have liked this meta post, but noone so far has asked any new questions.