For those of you who aren't familiar, Smashwords is a ebook retail site that provides readers options beyond the proprietary Kindle and Nook formats, and provides authors like myself with access to various ebook sales streams like the Apple Store and many others. While Rhubarb has not made its way across their full wide net yet, you can download it from Smashwords directly right now.
No, seriously, right now. Go. Thanks.