Meanwhile, you might enjoy this white paper (“A Buyer‘s Guide to Web Security Solutions”). It includes:

A discussion of the three main types of web security solutions available today appliances, virtual appliances, and SaaS cloud solutions and the advantages & disadvantages of each.

A comparison of popular web security products, in terms of their features, effectiveness, and so on.

A survey of the protection provided by these web security solutions, most of which have some important gaps in their coverage. This white paper lists the solutions that are leaving their users with potentially significant vulnerabilities.