For personal use: AIDA32 is a FREEWARE application, so it's free to distribute and use for any non-business purposes.

Features:
-full hardware & software information on 85 pages
-built-in hardware database: detailed information about 27000 components
-physical information for CPU, motherboard, hard disk, optical drive
-motherboard chipset, buses, sensor information
-installed programs, event logs list
-diagnostics module to reveal possible problems
-memory benchmark
-automatic audit via command-line switches
-SQL database support (ADO/ODBC)
-remote control through TCP/IP network
-32-bit low-level hardware detection
-multi-threaded program model
-full Windows XP compatibility
-full Windows Server 2003 compatibility
-Iomega Active Disk support
-English, Bulgarian, Catalan, Chinese, Croatian, Czech, Danish, Dutch, Finnish, French, Gallegan, German, Hungarian, Italian, Japanese, Korean, Lithuanian, Macedonian, Norwegian, Polish, Portu...

Added professional users guide (english).