One use of the web in your classroom is as a place to post important notices such as classroom policies or a course syllabus. This allows students easy access to these documents and if they lose their copies,they can just get it off of the web.
For an example, please see this page.
If you place a list of your class assignments on the web, students will have access to them anywhere they can get access to the internet (home, friends' homes, many public libraries, internet cafés, etc.). It then isn't unfair to hold them responsible for turning in work on time that they missed being assigned.
It can become annoying, however, to constantly update a page like this. If you are able to plan your assignments far ahead, this may work for you.
Another idea is to place the handout for large assignments or projects onto the web so that students will have access to them if they lose their copies.
For an example, please see this page.
If you want students to find information about a topic using the internet, making a page with links to reliable sources of information is a good idea. For instance if you want them to discover information on the space program, you can have links to NASA and the Smithsonian. If your students do an internet search, they'll probably wind up at the "Rabbi in Space" page.
For a better example see this page.
If you are trying to teach content that isn't well represented by chalkboard drawings, you can create a presentation for your students on the web which includes animation and sound as well as text and images. These take a lot of work to develop but the students respond well to them. Luckily, there are many of these types of presentations available on the web.
For an example, please see this page.
Many teachers have taken their knowledge of writing for the internet and passed it on to their students. Students enjoy creating their own pages and having their work placed on the web where everyone in the world can admire it.
For an example of this in social science, please see this page.
For an example of this in physical science, please see this page.
This way of using the web takes time to set up, but the students respond well to it. Start with a page you design. Include basic information about the topic of the lesson. Then use links to link your page to other pages on the web that relate to your topic.
A good idea would be to use a separate frame for a navigation bar so that the students could return to your site at any time.
An example of this would be a lesson on famous art. You can start out with some basic information on the art and then have a link to a virtual tour of the Louvre. Then the students can go back to your site and follow other links to topics they found interesting during the tour.
Many other "connected" teachers have done this. Try to search them out before putting all of your time and energy into creating a new one.