A great example is Michael Shapiro's book, The Internet Planner that describes in detail how to use the Web to book your perfect trip. Agencies are also going to the Web. Unfortunately, much web design is focused on pleasing the Internet designers, not the end users. This is why so many sites are ineffective. Links don't go to logical resources Links don't work.
Correspondence requires feedback.
You can also use regular email, but please, don't use CC but Bcc. Allow people to select various options. If you want to be more fancy, you can use the Egroups website which provides free archival space for mailing lists. Attachments are not permitted. Click here for details.