In a small bowl, whisk together the shallot, mustard, honey, vinegar, salt and pepper. Slowly stream in the olive oil as you whisk until emulsified. Set aside.
Preheat a grill to medium-high heat. Lightly rub the corn with oil, then grill until charred on all sides. Set aside to cool, then remove the kernels from the cob.
In a large salad bowl, mix together the romaine, basil and chives, then toss with just enough dressing to coat. Arrange the nectarines and grilled corn over the greens, then crumble the blue cheese on top. Serve immediately.