Chennai-headquartered CHI-SI is a chapter of Association for Computing Machinery‘s (ACM) special interest group on Computer-Human Interaction, SIGCHI. CHI-SI hosts a national conference every year.
Bill Scott, Director UI Engineering, Netflix, puts down his musings on rich web design and user interface engineering at Looks Good Works Well.
SF-based Adaptive Path does some really interesting work on user experiences. They also maintain an interesting blog.