I second ravells, dots in the center of the hex are great for LOS purposes and hex numbers are great even if you don't put the game away ("I'm moving to/shooting at hex B8."). Also, could you elaborate more on what these maps are used for? A sense of scale would be nice - is each hex 5'?

Where did you get the hexgrid? I like hexes over squares, but I find it difficulty to make "square" buildings/rooms fit onto a hexgrid (at least not cleanly).