Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Site oriented towards forest and crop-associated insects in the southern US. Has links to Forestry Images, Invasive/Exotic species, IPM Images, and General Insect Images. These sites each have their own web address (and are running off the same database, apparently), but "Bugwood" seems to be the top level.
http://www.bugwood.org/

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jump to Forestry Images | Forest Pests | Invasive.org | First Detector Training (exotic/newly introduced plant pests) | Colorado Insect of Interest Fact Sheets

the structure of this conglomerate is indeed messy & confusing, and some parts are pitifully outdated, too --but others seem quite useful

Bugwood Network
Thanks for the tip, Patrick. The "running off the same database" observation explains what I've been seeing in Google -- multiple-URL search results pointing to the same image(s). Search engines generally frown upon this because users find it frustrating; once Google recognizes the situation, they'll (hopefully) filter out the duplicates.