New manager preparing for hiring

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I am relatively a new / young manager, especially in respect to hiring. I have only had to hire for 3 positions so far since becoming a management level employee and have no formal training in the realm of hiring/interviewing. Does anyone have any suggestions on what type of questions should be asked in an interview? This go around, the job is for a mid level IT position. I myself have been on interviews that ranged from odd ball "If you where a tree, what kind of tree would you be" to other places that give me a 10 or so question industry related quiz on paper to fill out while filling out the application. In my opinion, the most important trait for this future employee would be trainability. Most people who work in the realm of IT will likely admit that being able to learn on the job is key to keeping your job. What type of questions do you ask in an interview to get a candidate to demonstrate that they have this skill? Also, any suggestions on what to avoid (other than the obvious questions that are illegal due to EOE)? If you know of a good site or other resource on conducting interviews and what to watch for during interviews, please do share.