Helpful for Web research when you want sites that are considered authoritative and reliable. High School Hub Good centralized location for free, online academic resources targeted to the high school student. Strictly speaking, this site is more of an educational gateway or portal than a directory, but has many useful resources. Be sure that you scroll down the page for all its links. Infomine Compiled by college-level academic librarians at the University of California campuses.
Lists have reliable descriptions.
A good place to look for reliable, accurate sources of information. Generally good descriptions of sites are given. The guides have varying level of expertise, but generally know their subject well and index useful sites. This directory is clear, uncluttered and easy to use. It also allows for keyword searching.