Join an information collection project that might include contributing to the creation of a database and pooled data analysis. Publish resources and projects created by you and your students and invite others to contribute. It is both a strength and liability of the Internet that anyone with access to a server can publish on it. Noting who publishes and sponsors a site is an important step in determining the reliability or potential bias of information found there. A mention of the time of the last update should be prominent.
Some sites have a very specific appeal, others are much more broad.
Many sites include links to other relevant sites. A site should be attractive and easy to navigate. A good homepage, the first page of a site, is simultaneously an advertisement for what's inside the site and a guide on how to get there. Flashy graphics and other media shouldn't distract from the message being communicated or be so large or complex that the time to load those pages on your computer becomes too long. At the same time, don't lose sight of the usefulness of current and high-quality text and images.