FYI, pg made a "Request for Startups" a couple of years ago, detailing problems he'd like startups to solve. You'd also know that those problems are fundable.
Yes, I'm aware of them, thanks! :) I'm interested in hearing more from other people as well. I'm not looking for any ideas to go after myself - I'm currently busy enough with uni and a startup job - but always love hearing ideas like these!