Big Picture day

At this stage of my PhD work I want to keep an open mind to new ideas, however I don't want to lose my focus...

How can I cope with both these seemingly contradictory goals?

I've tried several things in the past, but now I'm trying to have a "Big Picture day" in the week. I use this work day to keep track of the cool and interesting science and technology stuff out there: I read papers, news, mails, web sites, etc.
If I make a new connection with my work, I'll write it down and look it up later.
In the remaining days of the week I refrain from looking at stuff, to avoid distraction.