This guide provides resources on the person and work of the Holy Spirit. While most of these resources are academic, some woeks hat are no acdemic but potentially useful have been included.
This is a general overview of the doctrine of the Holy Spirit. It considers the personality, personhood, and deity of the Spirit; the work of the Holy Spirit in the Old Testament and some NT books, in the life of Christ, and the Spirit's role in the church.
This is not specifically a site on Pneumatology but Craig Keener has several lectures, short videos, and blog posts, written from an academic perspective.
New Dictionary of Theology by 
Evangelical Dictionary of Theology by