Creating a self-extracting installation with IExpress:
Windows 2000 and XP include a useful little tool that is almost unknown to most – it’s called “IExpress” and is easily accessible at Start -> Run -> “IExpress.” IExpress allows you to create a self-extracting Windows-style installation wizard. First, you will need to answer IExpress’s questions about the behavior of the installation (most will choose extract and then run); then, you will be bombarded with a series of dialogues requesting attributes; finally, you will need to specify the files to be packaged. This is not the most elegant installation tool out there, but it is free and easily available, so it is highly recommended.
Source: PC Mechanic
Wow, I never knew about it.