Apple yesterday released Express Card Update 1.0 for MacBook Pros. According to Apple's explanation on their Web site, the 492KB update "resolves an issue that prevented the system from sleeping when some cards are inserted in the ExpressCard/34 slot."
In other software update news Apple also issued a version of Security Update 2006-004 for the new Mac Pro. According to Apple Insider:
Although the majority of the fixes released in last week's Security Update 2006-004 were built into [Mac OS X v10.4.7] Build 8K1079, two were left out because they were not fully tested in time for the manufacturing of the Mac Pro.
Go get 'em, Tiger.