Impact factor of HCI journals

I was looking for some sources of Science Citation Index impact factor, and I found the following two resources: http://del.icio.us/giorgio.venturi/impact+factor It seems that the most important journal in the HCI arena is Human-Computer Interaction, followed by: User Modeling And User-Adapted Interaction Interacting With Computers International Journal Of Human-Computer Studies I also found a very interesting article on the evolution of the HCI field, based on the co-citation analysis.