From the Internet Scout Project:

The University of New Mexico's Institute of Meteoritics (IOM) claims to be the first institution in the world dedicated to the study of meteorites.

The U.S government has gotten involved recently in open source publishing with the creation of PubMed Central through the National Center for Biotechnology Information and the National Library of Medicine. PubMed Central is a digital archive of life science journal literature which offers free and complete access to the contents of approximately 50 peer-reviewed journals.

For those with a budding interest in lepidoptery (the study of butterflies), this fine online resource presented by the USGS's Northern Prairie Wildlife Research Center will be worth checking out.
Who can resist butterflies?

Geographers have contributed much to the interpreting and documenting landscapes, though not nearly as many of them have a presence on the internet. Now comes the Great Mirror website, created by geographer Bret Wallach, who is also a professor at the University of Oklahoma. On this site, visitors may peruse over 5000 photos.

Like all great urban public spaces, Times Square in midtown Manhattan is many different things to many different people. This hallowed place celebrated its 100th anniversary on April 8th, complete with a massive cake, confetti, and a dedication by Mayor Michael Bloomberg.

New York Daily News: Happy 100th, Times Square!
New York Times: 100 Years Ago, an Intersection's New Name: Times Square {Free Registration Required}
New York Post:Times Square: Critics Myth Again
The New Yorker: Times Regained
Times Square Cam
Times Square Information Website

GeoWeb is part of SRI International 's DARPA-sponsored Digital Earth Project. It is "a vision for making all geographically referenced, or georeferenced, data available over the Web."

Online since 1996, the Humanities Magazine is the magazine of the National Endowment for the Humanities (NEH). Designed to complement the detailed information on the operations and grant opportunities presented on the main NEH website.

The American Museum of Natural History has a searchable database of Amphibian Species of the World
The database catalogs over 35,000 species. It is easily navigable by either searching or exploring.

I've seen about half a dozen "tray" weather programs, and nothing beats Weather Watcher 5.4b, created by Mike Singer.
It's easy to configure, easy to read, and accurate.