These are all taken from Nokia's official YouTube channel and the techniques are demonstrated on the Lumia 1020, though with the recent release of the Pro Camera application for the older devices (920/925/928, at least once they've been upgraded to Nokia Amber) the tutorials will be mostly applicable to users of these phone cameras too.
Here then are the four tutorials:
1. Zoom and Reframe
This is perhaps the headline feature of the Lumia 1020 and using its underlying 41 megapixel sensor to best effect, but a degree of reframing is also available on lesser devices. Watch this space for a feature on this.
2. ISO and Shutter speed
This nicely demonstrates the tradeoffs between ISO, shutter speed and exposure. Most experienced photographers can juggle these in their heads, but Nokia Pro Camera helps out with automatic adjusting of one parameter while the others are adjusted, with 'red line' warnings, and with 'live' previews, giving an idea of what the result of a photo might be.
3. Focus and Bokeh
The 'trick' of focussing and then reframing isn't something which we've seen much in Windows Phone in the past, thanks to the weak feature set of the default Camera application. However, third party applications have allowed proper focus control and now we'd have to put Nokia Pro Camera at the top of the heap in terms of usability - for Lumia devices, at least.
4. Low light and long exposure
Although this involves a slight degree of 'cheating' in that a tripod is used, the four second shutter maximum is used to good effect here - cue new Internet memes in light trail shots on social sharing sites?
You can find all these videos and more at Nokia's YouTube Channel.