The Palmetto Trail is an ambitious plan for a 425 mile (684 km) hiking and mountain bike trail in South Carolina. Currently, some 225 miles (362 km) of the southern portion are ready.
Here's the SC Trails' description of the Palmetto Trail, with a very good fact listing of every seperate section.
Well structured introduction to the Palmetto Trail in South Carolina.
Backpacker's intro to the trail.
Spring hike. Blog. Fine pictures.
Picture report, part of the trail.