I thought I'd let you know about the summary log file available to you from the installer.
Summary.txt is a summary of the latest installation and can be found under %ProgramFiles%\Microsoft SQL Server\Setup Bootstrap\LOG. It will contain paths to all other setup log files for the most recent installation and will indicate which, if any, package failed. This would be a great file to provide if you are contacting the newsgroup with an installation issue.
All other setup log files can be found under %ProgramFiles%\Microsoft SQL Server\Setup Bootstrap\LOG\Files, although if we need further information from you, we will generally only ask for SQLSetup####_????????_Logs.cab - a compressed collection of the log files for a particular installation.
#### is a sequential number generated by SQL Setup for a particular installation.
???????? is your Computer Name.
Jeffrey Baker, SQL Setup Development