There has been a lot in the news lately about Avian Flu. With bird feeding season here there are concerns about the possible risks. There have not been any reprots of Avain Flu in the U.S. and no indication from anyone that there is any risk from feeding birds.
Here are a couple of links to consider.
From the Cornell Lab of Ornithology
From the Wild Bird Feeding Industry - includes additional links including the U.S. Center for Disease Control