Like the previous poster, I joined this site primarily to express my admiration for Echo. It's a fabulous piece of software, head and shoulders above the other clipboard extenders out there. The level of thought that went into the design is really impressive.
I do however want to note that I have the same problem posted by Hangdog on January 7th and Silat on April 6th: in Windows 7 x64, for some reason, the status of the tray icon is not saved between sessions. In other words, when the tray icon is set to "Show icon and notifications", it appears, but it will not persist once the user has logged off. On the next login, the icon is hidden again and needs to be reset to "Show". The settings for the tray icons of every other application I'm using persist between sessions; Echo is the only exception. From earlier comments by Tranglos and others I gather this is not a problem in 32-bit versions of Windows, but there does seem to be something about Echo that makes it problematic for the 64-bit version to retain this particular setting, although I can't imagine what it is. (I'm using Windows 7 Home Premium x64 and loading Echo via the Start Menu > Program> Startup folder. Haven't yet tried loading it with a scheduled task at login instead; I suppose that might make a difference to the way Windows handles it.) It's not a big deal, but I wanted to make it clear that it's a real thing, not just some funky aberration caused by something specific to Hangdog's and Silat's systems.
But mostly I just wanted to say bravo, and thanks for making it available for free.