Here are several links from my favourites list

The Tree of Life

Checklist of UK Recorded Species (Mapmate)

Bio Images Virtual Field Guide

Kieth Edkins Insect Photos

British Leaf Mining Fauna

Bees, Wasps and Ants Recording Society

The Coleopterist

Coleoptera.Org

Photogallery of Beetles

Diptera.Info

Tachinid Recording Scheme

Springtails (Steve Hopkin's Home Page

Families of Parasitiformes in Soil

Spiders of North Western Europe

Central European Spiders

Microscopy-UK

Classey Books

UK Moths

Leps Site

Heteroptera of Slovenia

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