A shade tolerance study was done at Clemson University during 2005 and 2006 on 42 different bermudagrass cultivars and the results have just recently been released. Celebration ranked the highest in shade tolerance of the 42 cultivars tested!
The study was performed at the Clemson University greenhouse complex where two sets of the cultivars were grown, one in full sun for eight weeks and the other in 64% shade for eight weeks. At the end of the two year study the results showed Celebration bermudagrass to have the highest shade tolerance of any of the tested varieties.
You can see a brief description and list of results at this site. For the complete description and results see here.