Julio Lugo had a set back in his rehab. According to the Boston Herald, he "will probably have to shut it down again for a while". It's possible he could miss the rest of the season. Oh yeah, and Tim Wakefield also threw a 44 pitch bullpen session. Looks like he'll be back before the end of the month.
http://www.bostonherald.com/blogs/sports/red_sox/index.php/2008/08/20/lugo-setback-wakefield-makes-strides/