[frossie]

I always mention the open source contributions of the team members to potential applicants and give them links that would enable them to find the source if they were so inclined.

I can see this being more of a problem in closed source places. But, remember that an interview is a two-way conversation. There is nothing wrong with asking questions like "so, what version control system do you use" and running away when they reply "err, tar?" or whatever your personal horrors are.