When was the last time you saw the logged out homepage and permalink pages of Twitter (tweet), Facebook (status) and Dropbox? Even better, try signing up for a new account on those services to see how their on boarding process has changed since you signed up.
I find it’s essential to keep a Chrome “Incognito Window” (Safari and Firefox call it “private browsing”) open to see how other sites handle non-logged in users and how good of job we’re doing. It’s also a great way to break out of your filter bubble, since even Google’s serves you search results based on who you’re logged in as.
Remember, if you’re growing most of your audience is not logged in like you are.