Emily isn't on zinc but I can help a little with the 'any information out there' part for you, since your question made me curious. <img src="i/expressions/face-icon-small-smile.gif" border="0"> Here is an article that seemed to show some benefit to zinc supplementation. It acknowledged that larger trials were necessary but results are interesting...
<a target=_blank class=ftalternatingbarlinklarge href="http://www.ncbi.nlm.nih.gov/pubmed/18446019">The effect of zinc supplements in cystic fibrosis patients.</a>
Digestive disorders causing malabsorption and frequent diarrhea (both of which can be big issues with cf!) can cause zinc deficiency. Products containing zinc are pretty widely used for those without conditions like CF in an effort to boost the immune system and help in recovering quickly from bugs like the common cold, etc. <a target=_blank class=ftalternatingbarlinklarge href="http://www.vitamins-nutrition.org/vitamins/zinc.html">More information about zinc for you</a>. Hope this helps a little!