There are a few web apps (Google Reader, Gmail, Twitter, ...) that allow starring items. I normally use the star function as a way to identify elements that require later action (to read/watch later, to answer later, ...).
Is there a way to consolidate starred elements from different web apps in a single view?
What I tend to do is instead of starring the items on those individual services, I put them all in one service. The one I prefer is Evernote. They have a bookmarklet and browser extensions which may speed up the process. Another benefit you get from using Evernote is you can tag it exactly as you want (e.g. to read, to answer, etc.) rather than an ambiguous star. The only problem is being disciplined enough to use a service like this rather than the star, since the star is so easy to click...
I ended up using Read Later instead of trying to unify starred content. Everything that has an RSS feed goes into Google Reader, and inside Google Reader I can now save articles for later (See Hanselman's post). I can also save links from Twitter on the iphone. The only thing missing is starred content in Gmail but that's not too bad anyways.
If you're looking for a quick way to get your starred questions from each of the Stack Overflow sites you could also use the Stack Overflow API. I threw together a quick app to demonstrate this:
