If we're not able to attend but would like to submit our resume to the YCombinator companies, is there a good place to do so? I'd be tempted to submit my resume via the application, but it doesn't seem fair to the startup companies to have to sift through resumes from people unable to attend.

We should build something for that. Stay tuned.

Any word on how many applicants will be invited?

Would it be possible for you to post a copy of the presentation slides for those that are unable to attend?

It's going to be streamed live, for those that can't attend: http://news.ycombinator.com/item?id=1346118