The rest of the programs listed in the Start→All Programs menu (at least the ones that come with Windows XP) are covered elsewhere in this book. Internet Explorer is cover in Chapter 11, Outlook Express is described in Chapter 12, Remote Assistance in Chapter 5, and Windows Media Player in Chapter 8.
There’s much more free Microsoft software available to Windows XP gluttons. For example, you’ll have a lot of fun trying out the popular PowerToys package (programs produced after the operating system’s release), the Windows Media Bonus pack, and additional screen savers. You’ll find them all here: http://www.microsoft.com/windowsxp/pro/downloads/default.asp.