Software as a Service
Software as a Service (SaaS)
Cloud based delivery of complete software applications that run on infrastructure the SaaS vendor manages. SaaS applications are accessed over the Internet and typically charged on a subscription basis.
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Billing (5)
Application services to manage customer billing based on usage and subscriptions to products and services.
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CRM (13)
Platforms for CRM application that range from call center applications to sales force automation.
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Collaboration (17)
Platforms providing tools that allow users to collaborate in workgroups, within enterprises, and across enterprises.
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Content Management (6)
Services for managing the production and access to content for web based applications.
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Document Management (5)
Platforms of managing documents, document production workflows, and providing workspaces for groups or enterprises to find and access documents.
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ERP (6)
Enterprise resource planning (ERP) is an Integrated computer-based system used to manage internal and external resources, including tangible assets, financial resources, materials, and human resources.
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Environmental Health & Safety (0)
Helps manufacturers manage and promote safe handling of hazardous materials.
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Financials (11)
Applications for managing financial processes for companies that range from expense processing and invoicing to tax management.
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Health and Wellness (2)
Services for improving and managing people's health and well-being.
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Human Resources (8)
Software for managing human resources functions within companies.
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IT Services Management (2)
Software that helps enterprises manage IT Services delivery to services consumers and manage performance improvement.
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Personal Productivity (5)
Software that business users use on a daily basis in the normal course of business. The typical suite includes applications for word processing, spreadsheets, and presentations.
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Project Management (11)
Software packages for managing projects. Features of packages may specialize the offering for specific types of projects such as software development, construction, etc.
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Sales (8)
Applications that are specifically designed for sales functions such as pricing, commission tracking, etc.
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Security (4)
Hosted products for security services such as malware and virus scanning, single sign-on, etc.
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Social Networks (3)
Platforms for creating and customizing social networking applications.

Comments
On the business intelligence side, the leading SaaS business intelligence provider is Birst www.birst.com
I would add PLM to the above list.
Logistics is a field perfectly suited for SaaS / PaaS offerings and as such Freigfhtgate has been a pioneer of such service from transportation procurement, execution, connectivity, end-to-end visibility, rate management all the way to inovice audit and payment.
As such I would encourage adding a category for Logistics in this nice overview.