Earlier this week while trying to figure out what exactly the "chelengk" on Jack Aubrey's hat was supposed to be (obviously made of diamonds) and not finding the word in either the Oxford American or the OED, I googled "chelengk" and discovered Lubbers' London - The Master And Commander Museum Trail. Also possibly of interest to Maturin and/or natural history fans is Snail's Tales, which I've been enjoying for a couple of weeks now.