MKhexgrid - a hex grid generator
The following spec.txt file seems to be working really well to generate a full page of decently sized, numbered hexes:
columns = 30
rows = 20
hex-side = 30
grid-grain = v
output = png
outfile = tut3.png
antialias = true
coord-bearing = 90
coord-distance = 18
Numbered hexes are the only way to map, and stocking all the hexes on Index Cards means that adventurers are never wont for adventures.