The Reds have signed Josh Anderson to a minor league deal to compete for an outfield spot. Here is Mark Sheldon's blog post about the signing.
Anderson has stolen 36 career bases in just under 500 at-bats. He's got a career .272 batting average, but only a .665 career OPS, with a weak .313 on-base percentage. He bats lefty, and I don't know that he's an upgrade over Chris Dickerson, but he should add some valuable depth to the outfield competition, and if he doesn't win a spot on the roster, he's a nice player to have in AAA for when he's needed.