Three tips to help new Google Summer of Code applicants and interns, some of which all remote workers could stand to remember:

1. Never let yourself get stuck on a technical question or problem for more than half an hour. Take a break, ask questions in IRC or a mailing list, find a technical book to read like The Architecture of Open Source Applications, look at some other codebase to see how they do it, eat a meal, or do something else, then come back to the problem.
2. Never let yourself get stuck waiting for someone's reply for more than 2 business days (Monday through Friday). Escalate -- ask your mentor. If your mentor isn't helping, ask your org admin. If the org admin isn't helping, ask on the GSoC discussion forum, or email Carol Smith.
3. Ask yourself at the start of every day: what did I accomplish yesterday? What will I try to do today? What are the obstacles I think I will run into? If you ask yourself those three questions and answer honestly -- especially if you let your mentor and team know the answers -- then you will prevent long delays and help keep your morale up.