You can select the Microsoft SQL Server 2008 features to be installed during the installation process.

Instance Features :
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Database Engine Services :
Includes the SQL Server Database Engine. Optional components include Replication and Full-Text Search.

SQL Server Replication :
Includes a set of replication objects for copying data and database objects from one database to one or more other databases.

Full text search :
Includes the full-text search engine, for fast text search on content stored in SQL Server.

Analysis Services :
Includes Analysis Services and tools used to support online analytical processing (OLAP) and data mining.

Reporting Services :
Includes Reporting Services, a server-based application for creating, managing, and delivering reports in paper-oriented and interactive Web-based formats.

Shared Features :
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Client Tools :
Includes management and development tools: SQL Server Management Studio, SQL Server Configuration Manager, SQL Server Profiler, and Database Engine Tuning Advisor.

Microsoft Sync Framework :
Microsoft Sync Framework v1.0 is a comprehensive synchronization platform enabling collaboration and offline for applications, services and devices.

SQL Server Books online :
Includes Books Online documentation for SQL Server 2008 and SQL Server 2008 Mobile Edition.

Business Intelligence Development Studio :
Includes management and development tools: Business Intelligence Development Studio.

Integration Services :
Includes the designer, runtime, and utilities that enable Integration Services to move, integrate, and transform data between data stores.