Just some other ideas off the top of my head....
Axillary versus rectal temps on newborns and infants.
Accuracy of tympanic temperature readings.
Troughs for IV medications such as Vanc or Gent versus troughs and peaks.
Alcohol preps for hands versus good old fashioned handwashing with plenty of soap and warm water.
Mouth care with chlorhexidine preoperatively to prevent ventilator-assisted pneumonia.
The usefulness of touch as a nursing intervention (or therapeutic touch, since this has been in vogue).
Humor and play as nursing interventions for children with cancer or other life-threatening diseases.
The use of guided imagery and/ or music therapy to ameliorate posteropative pain, nausea, and vomiting.
The use of prayer as a nursing intervention.
Family presence during codes or invasive procedures (lots of research on this topic).
Some other ideas or useful sites: