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This is correct. I had previously confirmed this through other reasearch and proceeded with installing my additional instances.
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I have a SQL 2005 failover cluster on Windows 2003 server. I need to add an addtional instance. Can I use the same cluster group and resources or must I add another group to the cluster and split up the disk drives between the two?
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I have a SQL 2005 failover cluster on Windows 2003 server. I need to add an addtional instance. Can I use the same cluster group and resources or must I add another group to the cluster and split up the disk drives between the two?

This is correct. I had previously confirmed this through other reasearch and proceeded with installing my additional instances.

SQL 2005 failover cluster - How to install additional instance

Microsoft SQL Server 2005 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. It includes support for managing XML data and allows a database server to be exposed over web services using Tabular Data Stream (TDS) packets encapsulated within SOAP (protocol) requests.