This was one of the first articles I read about
it:
http://www.webmd.com/ibd-crohns-disease/crohns-disease/news/20010810/first-patient-to-get-stem-cell-treatment-for-crohns-in-remission
Here is an abstract on a few case studies:
http://www.ncbi.nlm.nih.gov/pubmed/12931244
Overall it seems to still be in the early ages of research and some articles I have read seem favorable while others state that it just leads to remission but is not a "cure". It looks like they are looking for test subject as we speak:
http://clinicaltrials.gov/ct2/show/NCT00692939