The Broncos have signed 29-year old WR Darrell Jackson to a 1-year deal.  Jackson played in 15 games with the 49ers last season and he caught 46 passes for 497 yards (10.8 avg) with 3 TD grabs.  Jackson has now played in 111 games in his NFL career and he has caught 487 passes for 6,942 yards (14.3 avg) with 50 TD grabs.  He will give the Broncos another veteran wide receiver with upside which should help out the whole offense.