Not exactly extremophiles tonight. But I found a really neat article about a lovely sea slug, Elysia Chlorotica, which "steals" the chloroplasts of certain algae and derives nutrition from their photosynthesis: in a sense, an animal turns into a plant (picture above, from a neat blog called "Small Things Considered", which is the blog of the American Society for Microbiology; picture source here).
Also via Small Things Considered, a real extremophile, an archaeon that lives in water so hot and acidic it can melt metal rivets (probably worthy of another Sunday extremophile blogging), and the mind-boggling sex lives of mushrooms. The diversity of life never ceases to amaze me.