On his Spice Pages, Gernot Katzer offers “solid information on (currently) 117 different spice plants. Emphasis is on their usage in ethnic cuisines, particularly in Asia; furthermore, [he] discuss[es] the history, chemical constituents and etymology of their names. Last but not least, there are numerous photos featuring the live plants or the dried spices.” Und die Site gibt es auch auf deutsch.
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The Cook’s Thesaurus is a “cooking encyclopedia that covers thousands of ingredients and kitchen tools. Entries include pictures, descriptions, synonyms, pronunciations, and suggested substitutions. ”
Many more cooking-related links can be found in this MetaFilter thred: Internet smut for foodies.