This shows the status of all the Giants draft picks. As stated, players who have signed are in bold. So far, the only player to have signed is the Giants 10th round pick, RHP Jeremy Toole out of Brigham Young.
UPDATE: According to Schulman, the Giants have signed 23 of their 50 picks, the highest being seventh-rounder 2B Nick Liles out of Western Carolina University. (Schulman calls him Steven Liles, but both the BA list and the MLB.com Draft Tracker refer to him as Nick)