The simplest technique for me is to simply keep the tach below 2000 RPM (and this works in all cars, hybrid or not). In fact, I aim for 1500-1800 RPM, and only go up to 2000 to avoid pissing off the people behind me (well, I still piss them off, but at least not as badly). Slow acceleration is key. And if you see a red light ahead, don't accelerate towards it.
Beyond that, learn how to glide. You do this by letting your foot off the gas slightly. You'll feel a slight shudder as the IMA goes into charge and the instantaneous MPG meter goes up to 100. Then apply just a little more pressure until those charge bars go away (charging slows your momentum). Presto! You're gliding. If you continue to apply a little more pressure to the pedal, you can get 1-4 bars of assist while the MPG meter is still pegged at 100! No gasoline is being pumped into the engine. This is pretty hard to maintain for too long. Once the valves open and gasoline gets pumped in again, you'll feel a slight shudder and the MPG meter dropping.
You say you've read articles, so I assume you've read the following. But if not, here's a great guide (there's even a small section on hills):
Adapting Basic Hypermiling Techniques to the HCH-II