In the context of tackling a niggling problem that really could be dealth with in minutes, but appears to be taking forever - I find that a short nap (about 15-20 mins tops) helps me focus and gather my thoughts.
If you're in a crowded and/or noisy work environ, noise-cancelling headphones are useful for zoning out, and are more obvious than earphones, so people around you can see the reason for you not responding to them.
But as for "building" concentration because 'co-workers and the Internet' keep you from getting work done? No amount of mindhacks can help if you want to continue 'blaming' them for your distraction. Hard to fix a problem you claim to not have control over..
If you're in a crowded and/or noisy work environ, noise-cancelling headphones are useful for zoning out, and are more obvious than earphones, so people around you can see the reason for you not responding to them.
But as for "building" concentration because 'co-workers and the Internet' keep you from getting work done? No amount of mindhacks can help if you want to continue 'blaming' them for your distraction. Hard to fix a problem you claim to not have control over..