Ah yes, that's an excellent idea (and an excellent way to phrase it - "time-shifting").
Occasionally though, you might miss something if you time-shift it. Sometimes, I don't time-shift my reading for fear that I might miss something (oftentimes it's an opportunity to comment on the article while people are still reading it, in hopes that someone else will comment on it). I sometimes reassure myself that email notifications will take care of that, but some services (reddit in particular) don't give email notifications to people (they have another button of showing who replied to your post, but not everyone reads that)
A lot of times you may come upon a juicy-smelling "information scent". Now you have a decision of whether to extend your lunch break and cut into work by following the scent (bad) or abandoning it (painful, and possibly bad).
One thing that has worked for me is using either delicious or more recently instapaper app to save the link (instapaper will actually sync the entire article back your iphone/pad/android). Pang of pain is largely avoided, and I can decide later whether this bit of info was worth reading, by comparing it to my other saved articles in the app at the appropriate time.