Houston city officials and services are found at the City of Houston website. The Catalog of Federal Domestic Assistance features federal programs, projects, services, and activities which provide benefits or assistance to the American public. The Nonprofit Resource Center of Texas offers services to nonprofit groups in the state and includes the Directory of Texas Foundations online. The Foundation Center has lots of material to get you started grantwriting. Periodic Table of the Elements Mark Winter's WebElements provides a wealth of information on all 118 elements, including data on thermodynamic properties, compounds, atomic weight, and discovery.
Switchboard performs a search nationwide.
The publisher's directory at Northern Lights links to hundreds of websites. Yahoo's directory of publisher's websites is also handy. Bartlett's Familiar Quotations , 9th ed. Although general thesauri aren't abundant on the Web, you can search a Roget's for now. Rand McNally Online has free U.S. city profiles with a wealth of online information.