Uranium

Uranium and Its Compounds - Facts about uranium and its compounds, including physical and chemical properties, uses, and possible health effects.
http://web.ead.anl.gov/uranium/guide/ucompound/

It's Elemental - Isotopes of the Element Uranium - Has an extensive list about the isotopes of uranium. Gives mass number, half life, branching percentage, and decay mode of the isotopes.
http://education.jlab.org/itselemental/iso092.html

EnvironmentalChemistry.com: Uranium - Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/U.html

ChemicalElements.com: Uranium - Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/elements/u.html

UIC - Uranium & Nuclear Power Information Centre - The UIC web site is to assist public understanding of uranium mining and nuclear electricity generation.
http://www.uic.com.au/

It's Elemental: Uranium - Basic physical and historical information.
http://education.jlab.org/itselemental/ele092.html

WebElements: Uranium - Extensive information on history, uses, occurrence, compounds, and properties.
http://www.webelements.com/webelements/elements/text/U/key.html

The Element Uranium - Basic and advanced technical details and history concerning uranium.
http://dhost.info/aquatsr/uranium/

Uranium-235 Chain Reaction - Shows examples uranium reactions in fission, as well as data about those reactions.
http://hyperphysics.phy-astr.gsu.edu/hbase/nucene/u235chn.html

Depleted Uranium - Information about depleted uranium in question and answer form.
http://www.gulflink.osd.mil/faq/faq_du.jsp

ChemGlobe: Uranium - Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/92.html

Wikipedia: Uranium - Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Uranium

LANL: Uranium - Sources, properties, isotopes, and uses.
http://periodic.lanl.gov/elements/92.html

Lenntech: Uranium - Physical data, chemical properties, health and environmental effects.
http://www.lenntech.com/Periodic-chart-elements/U-en.htm

Uranium (Element) - Some quick facts about uranium, including all the basic info.
http://www.tamuk.edu/chemistry/WebElements/uranium_element.htm

Radioactive Byproducts of Depleted Uranium (Uranium-238) - Shows the byproducs of depleted uranium and shows their half-lives.
http://www.ccnr.org/decay_U238.html

WHO: Depleted Uranium - Information about depleted uranium and its potential health effects.
http://www.who.int/mediacentre/factsheets/fs257/en/

Visual Elements: Uranium - Image, animation, source, use, and key isotopes.
http://www.chemsoc.org/viselements/pages/uranium.html

Uranium: Properties: Element - Very extensive information about the chemical/physical properties of uranium. Information includes the occurrence of uranium, isotopes, and spectrum.
http://nautilus.fis.uc.pt/st2.5/scenes-e/elem/e09291.html