There was a tribal arts ite I used to use, but it was horribly organized and not very intuitive to navigate.
If you're not overly adverse to good, old-fashioned hardcopy - and in the event you don't already own a copy - I strongly reccomend
Shields: Africa, Southeast Asia, and Oceania. From the Collections of the Barbier-Mueller Museum.
Worth every penny for the African shield enthusiast IMO.
