Hi,

I would like to create a yellow arrow with black edges/controur for better visibility on a slightly yellowish background.
How can I do this?

1) Create a line
2) Add arrow marker on the line: select line, Object->Fill and stroke->Stroke style. Increase the stroke width to your liking.
3) convert the path into an object (Path->Stroke to Path)
4) Union the path and the marker to each other (select both, Path->Union)
5)Change the new objects fill and stroke colour and size to suit.

Ah, thanks a lot, had a few problems at first, but got it to work.
I'm already starting to love inkscape.