1. Prepare grill.
2. Combine first 5 ingredients in a small saucepan; bring to a boil. Reduce heat, and simmer until reduced to 1/2 cup (about 5 minutes). Keep warm.
3. Place sausage on a grill rack coated with cooking spray, and grill for 10 minutes or until done, turning occasionally. Cool. Cut in half lengthwise, and cut each half crosswise into thin slices.
4. Place clams in a disposable aluminum foil pan. Place pan on grill rack; cover and grill 5 minutes. Uncover and grill 5 minutes or until shells open. Discard any unopened shells. Combine clams, juice from clams, wine mixture, sausage, tomatoes, and parsley in a large bowl. Divide the clam mixture evenly among 6 shallow bowls. Serve with lemon wedges.