After spending a bit of time playing with Conky I wondered if there was a Windows option. Turns out there is - it is called Samurize and it comes with a functional GUI editor to make all your system monitors very easily. At the moment I have quite a fascination with the clock style meters. A picture of my configuration is below and you can get the clock meter configuration from here.
The big one in the middle is a clock that ticks round with seconds, minutes, hours, day, month working from the outside in.
It's quite a nice funky addition to my desktop. I like it!