Great idea to make the crocheted hats!
For folks who are wanting to help but may not know how to crochet (or do not feel that their skills are up to the task), there is another way to help.
If you have a sewing machine and can sew a straight line, you can make pillowcases for the cancer kids. I do this with one of the local churches.
Here is a link just so you can get the idea. Check in your local area to see which hospitals have a group of volunteers and join in the cause.
http://caseforsmiles.org/get-i...
Even if a person cannot crochet, knit or sew, you can always have fun by shopping for yard and fabric and donate that to the cause in your local area.