With starting quarterback Kyle Boller sidelined indefinitely by a severely sprained toe, the Ravens on Wednesday signed veteran free agent Kordell Stewart to bolster the depth chart. A 10-year veteran, Stewart was with the Ravens in 2004, and appeared in two games, but the team did not attempt to re-sign him this spring as an unrestricted free agent. Stewart drew very little interest, in fact, in the free agent market. But when Boller was injured on a sack by Indianapolis defensive tackle Larry Tripplett on Sunday, and tests indicated that he would miss playing time, the Ravens phoned Stewart. Baltimore officials considered a few other free agent quarterbacks, including Danny Kanell, but Stewart's familiarity with the Ravens offense gave him a big edge. Stewart spent much of Tuesday at the team complex, meeting with coaches and going over the playbook with them