article about practicing thankfulness from the always-excellent PsyBlog -- this rings so true for me. Simply recording things I'm thankful for actually makes me happier, and gives me something to lean on when I'm feeling less thankful.
One of my favourite childrens' book blogs does this every week with their readers, usually combined with a profile of an author or illustrator -- they call them 7 Kicks, and they're up to #92 already. So every week, the co-bloggers each share seven "Exceptionally Fabulous, Beautiful, Interesting, Hilarious, or Otherwise Positive Noteworthy Things from the past week—whether book-related or not" and their readers do the same in the comments. Nifty.