Build HN User profile analytics. Basically, a dashboard page that shows users by location, professions etc. Obviously, it depends heavily on what the user has in their profile. For example,the dashboard could show "Well known entrepreneurs" which would display info of lot of founders/co-founders of companies that are on HN.
If a user profile does not have any info, then scrape through their comment history and find out keywords like location, profession etc. I see many users commenting like "I am the co-founder of...", "I am a lawyer...", "I am a CPA...", "I live in San Francisco..." etc. This could be great way to find those people.
Python Project and Web App Idea Generator, written in Python. Scrape HN for "Show HN:" submissions and append "written in Python" for project ideas.