Kev, could you please do me big favor and add a little code/image example how you did the glow?
I think I'll never get it :-(
Or do you have a link where it is explained with sample images and code?

Kev: I just did what seemed logical, for each line in the svg I create a quad with the line across the centre. I set the outer colour to black and the inner to the colour the line wants to be. Overdraw this with a additive blending and a few different shades to build up a glow. Wouldn't really work on sprites of course, I'll try and put a demo into slick for it later.