Analysis Services is Microsoft's industry leading OLAP database management system that comes with SQL Server 2000 and 2005. This product enhances SQL Server's relational database architecture to accommodate and facilitate multidimensional analysis.

Hyperion is the vendor of Essbase - the OLAP database technology industry leader for several years until 2003. They also have a suite of Business Intelligence and BPM related software packages and tools that focus on specific business functions and/or industries.

The Microsoft Developer Network (MSDN) Library Excel site containing in-depth content, code walkthroughs, downloads, product information, and more for Microsoft Office solutions developers.

A website that offers support and a wide variety of services to users of Microsoft Excel software, including an active message board, tips, tools, articles and book references.

Joseph Rubin's Excel focused website offers tips, a blog and an active forum as well as information and links on training, books, and consulting.