Hint - use linked thumbnail images to speed navigation. Provide search capabilities on more complex sites. Allow browsers to search your site without having to drill through every page. Take dates off all documents. Dated pages can appear old or stale.
Dead links are a sure sign of a neglected site.
Use trendy design elements. Trendy elements will look dated when newer items kick in. Provide visit counters on Web pages. A Web counter can point out how few times a page has been visited. Provide unwarranted guest books or feedback forms.