zoology

• animal diversity
• animals: a research guide
• mammal species of the world
• birds of the world
• butterflies and moths of north america

science

• astrophysics data system

literary

• arts & letters daily
• project gutenberg

fun

• wiki spy
• fridge poem
• window swap
• lurk.me
• radio garden

calm

• i miss my café
• do nothing for two minutes