[dgaust]

1) Why would you need a analogue and digital receiver? With all channels now broadcast in digital surely you wouldn't want to use the analogue signal?

Some people still capture an analogue signal. Maybe from a foxtel set top box, or because they're in a non-digital area.

If you don't use either, you only need a digital card.

2) Are all digital tuner cards HD? It seems that some that are HD dont even advertise in their specs that they are!

Yep.

3) What is the current 'flavour of the month' regarding tuner cards? The Hauppauge cards seems to be a good choice but which one?

Most people are recommending the 2200 at the moment. It's expensive though due to it being a hybrid with hardware encoders.

4) Do most cards have hardware compression for when you capture the video or is the CPU doing this work?

No, the digital ones don't. Some analogue ones with hardware encoders will do the work for you (on the analogue signal only).

5) (not tuner related) Do HDMI outputs on motherboards do video as well as audio?

That's why they're there.