The Glass is Too Big has a good post, suggesting you start abusing books more – only your books, not library books.
I dogear for 2 different purposes. I use the top right corner of the right page as my bookmark. I also use the bottom corner of a page that contains something interesting as a marker as well. That lower dogear is often accompanied by notes written in the margin. By folding over the bottom corner of interesting pages, I can quickly look at a book of mine and see how useful I find it. It also lets me flip through a book I havenâ€™t used in a while and easily find the bits Iâ€™m likely to want to find again.
Nice simple idea – he says it also makes it easy to see how much useful stuff is in a book at a glance, just by seeing how many pages are turned up at the bottom.
(Thanks to Boing Boing.)