One thing I've used his tools for is to create a 20km x 20km grid network for Great Britain that lines up with the National Grid - in effect a 'tile finder'. The reason I did this is because when you need to add a 20km raster tile to a vector map it's often difficult to know which one you need (unless you know the National Grid letters off-by-heart!). Here's the result:
And here's how it looks with labels turned on and two raster tiles (OS 1:50,000, from digimap) in place:
I've shared this file with the higher education GIS user-community in the UK, and it is available from the new ShareGeo section of digimap.
