I agree with Heather. A lot of people in my family/life just asked. You will get insensitive questions, so be prepared for that. However, most people are just curious. When we started fund raising (about 8 months after diagnosis), the first letter we sent out had a lot of information about CF in it. That took care of some of the basic stuff.
When Abby started 1st grade and would be taking enzymes in school, we had her social worker and a nurse from her clinic come in and talk to her class about CF. Even brought her vest in so the kids could see what life was like for her. There is a Bill Nye the Science Guy video out there too that is very informative for small kids.
Now that she's in middle school, she wants to blend in and not be "different". If someone sees her taking a pill and asks her about it, she tells them as much as she is comfortable. I don't think she is ashamed, because a lot of her friends know and don't care.
CF varies so much from person to person that I do not direct close family to sites like WebMD, etc. I know it freaked me out when they were talking about testing her for it. The www.cf.org is good, though general.
Hope this helps a bit....