ASK HN: How to hire good employees?

I run a small web design & development company that deals mostly with small-businesses and local colleges. We're about to open our first office and would like to bring in two or three developers to help with the workload. Most of the work we've done so far was outsourced to out-of-country developers, so this would be the first time we're hiring inhouse developers.

We're planning to recruit from the local colleges, we're in NYC so there's no shortage of CS/engineering schools. I've put together a list of questions and talking points that I want to cover during the interview, but it's difficult to assess whether or not they are sufficient.

Can anyone recommend good reading material on proper interviewing processes? Any advice you can provide would be appreciated.