The Tennessee Titans have signed starting right tackle David Stewart to a multi-year contract extension. Stewart signed a one-year tender earlier this offseason as a restricted free agent. The new contract provides the Titans with lasting stability at key positions the offensive line. Left tackle Michael Roos agreed to a multi-year deal in April. ?The ability to get both Michael and David under contract long term is a huge part of growing a young team,? said Titans General Manager Mike Reinfeldt. ?David is the prototypical right tackle in my mind, and his style of play sets the tone in a lot of ways for our line and our team in general.? The 6-foot-7, 318-pount Stewart, appropriately nicknamed ?Big Country,? has started 30 games at right tackle during his three-year career, including all 16 games in 2007. Originally a fourth-round selection (113th overall) in the 2005 NFL Draft, he was inactive for every game as a rookie but emerged in 2006 with 14 starts and a reputation as one of the team?s most physical players. He played an integral role in the NFL?s fifth-ranked rushing offense in both 2006 and 2007. A native of Moulton, Ala., Stewart started 35 consecutive games in his career at Mississippi State and earned honorable mention All-Southeastern Conference honors as a senior.

The Chiefs have signed tackle Barry Richardson to a three-year contract, according to The Kansas City Star. He was a third-round pick by the team in this April's NFL Draft. Richardson started each game in his final three seasons at Clemson and was chosen All-Atlantic Coast Conference in 2006 and ?07.

The Raiders signed former Nebraska quarterback Sam Keller to a contract Wednesday and waived quarterback Erik Meyer, as reported by the Associated Press. The Raiders expect Keller to compete for a backup QB job.

The Giants have signed guard Chris Snee to a six-year deal, according to The Record. The extension will keep Snee in New York until the 2014 season and makes him among the five highest-paid guards in the NFL, according to a league source.

The Buffalo Bills have signed offensive lineman Brad Butler to a contract extension, according to The Associated Press. Terms of the extension were not immediately available, but the deal is expected to provide a significant raise over the $445,000 base salary Butler was scheduled to make this season. He was a fifth-round pick in 2006 out of Virginia.

The Giants on Tuesday signed three draft choices, including quarterback Andre Woodson, according to a Yahoo.com report. A sixth-round pick out of Kentucky, Woodson has a good chance to make the team especially since the Giants waived backup quarterback Jared Lorenzen on Monday. Woodson?s 9,360 career passing yards rank second in Kentucky history, second only to Lorenzen. He also finished his career with 79 touchdown passes and just 25 interceptions. New York also signed linebackers Bryan Kehl and Jonathan Goff, its fourth and fifth-round choices, respectively.

The San Francisco 49ers have agreed to terms with offensive lineman Barry Sims, according to John Clayton of ESPN.com. The 49ers beat out the rival St. Louis Rams for his services. Sims agreed to a two-year deal, but financial terms weren't available.

The Giants on Friday signed defensive end Robert Henderson, one of their two sixth-round picks this year, as reported by Yahoo.com. The Giants also added depth to their receiving corps, signing Craphonso Thorpe, who was acquired off waivers from the Jaguars earlier in the week.

The San Diego Chargers have signed free agent wide receiver and punt returner Mark Jones to a one-year deal. Originally drafted by Tampa Bay in the seventh round in 2004, the 5-9, 185-pound Jones ended up spending his rookie season with the New York Giants after being waived by the Buccaneers. He re-signed with Tampa Bay in 2005 and spent the 2005-07 seasons in Tampa Bay. Jones is a wide receiver, but his NFL experience has been exclusively as a punt returner. In 2007, he returned 12 punts for 143 yards (11.9 avg) with a long of 35. His year was cut short, however, by a knee injury that landed him on Injured-Reserve on Oct. 24. He has since recovered from that injury. ?Mark?s versatility was very attractive to us,? said General Manager A.J. Smith. ?He?s an experienced NFL punt returner and a solid player who will raise the level of competition in our camp.? For his career, Jones has 117 returns for 1,017 yards, an average of 8.7 yards per return. The 27-year-old Jones was born in Wallingford, Pennsylvania. He attended Strath Haven High School and the University of Tennessee. The Chargers have also waived four players. They include cornerback Stanley Franks, guard Charles Manu, running back Germaine Race, and defensive tackle Keith Shologan.

The Bears have agreed with defensive tackle Tommie Harris on a four-year extension through 2012 worth approximately $40M, including $18M in guarantees and $27M over three years, according to sources familiar with negotiations and reported by ESPN.com. The extension makes Harris the highest-paid defensive tackle in the NFL's history.