National Weather Service graphical products
Accuweather's forecast movement, with links to other maps
For those of you who swear by The Weather Channel, or the most easily remembered URL...
The National Hurricane Center issues bulletins on the position, movement, and strength of tropical systems every 6 hours, and the updates don't get more frequent until very near landfall. All of these maps, by the NWC and by others, are based on these bulletins. Therefore, for Isabel, the best times to check for updates are near 5am, 11am, 5pm, and 11pm EDT.
The most dangerous part of a hurricane is the storm surge. Catastrophic damage tends to occur only on coastlines, and the rare times that happens north of Florida, it is nearly always a south- or southeast-facing coastline that gets hit with the worst.