I was searching Amazon for an O'Reilly book and I came across a listing for Mac OS X Tiger: http://www.amazon.com/exec/obidos/tg/detail/-/B0002G71T0/ qid=1111518588/sr=8-1/ref=sr_8_xs_ap_i1_xgl147/102-0873529-0624916? v=glance&s=pc&n=507846 Perhaps the release of Tiger is coming up soon? The rumor sites say April 15, you never know...