Installation is simple... except you need to edit a few text files which may drive you mental.
1. First download and install Rainmeter, and Gnometer if you haven't already done so. Both are free and only a google away.
2. download the zip file and extract it to the Gnometer skin folder. Usually My Documents\Rainmeter\Skins\Gnometer\
3. Jump into the subfolder "Astro" and open Forecast 5-day.ini in Notepad.
4. Scroll down and look for the line:
Url=http://www.7timer.com/v4/bin/astro.php?lon=153.06&lat=-27.405&ac=0&unit=metric&output=xml& tzshift=0 and replace the "lon=###.##&lat=-##.###" with your location. 153 E and -27.4 N are co-ordinates for Brisbane.
Now the Astro plane should be setup.
8. Then go into the folder "Weather (Moon)" and edit the lone .ini file in there.
9. Change the line
Url=http://www.wunderground.com/sky/ShowSky.asp?TheLat=-27.38416672&TheLon=153.11749268&Tim eZoneName=Australia/Brisbane&MR=1 and again edit the location data to suit.
Now the weather pane should be setup.
10. Finally simply right click on rainmeter, click Manage, and then go through and load the relevant panes.
Well it's all quite easy isn't it.
Well I did say I was a nerd, but if anyone here is interested and wants to give this a go then by all means. Post here if you have issues and I'll try my best to help you.