I have my Intel iMac (17"/2CD/10.4.11) set to automatically look for software updates once a week. I seem to get a dirtbagful of these on a regular basis — for iLife apps. as well as QuickTime, and OS X Security updates. Today, I got a Security update prompt for 2008-006 1.0 at 159 MB !! Not long ago I updated to 2008-004. But they seem to be getting bigger and bigger, as far as MBs go. I just wonder if these updates actually subtract from available hard drive memory, or if they work some other way. No clue. Also, the update info usually says something like 'previous security updates have been incorporated into this security update.' Does that mean I can skip the odd update and catch up down the road? TIA for any insights on this.