At the moment Coco Crisp is listed as the Red Sox starting center-fielder. For a variety of reasons, I feel as though this will not be true once the season starts.
Center field is the ONLY position which will see a different starter in 2008 than in 2007. Jacoby Ellsbury shot through the minors last year, hitting .452 in 73 ABs at AA Portland, then hitting .298 in 363 ABs at AAA Pawtucket. He then hit .353 in 116 ABs with the big club.
Oh yeah, he was also a candidate for World Series MVP, going 7 for 16 (.438) with 4 doubles and 3 RBI. It would have been amazing had he won it, considering he still hadn't had an official rookie season.