My 3-week-old MacBook Pro 2.33 GHz installed the update fine, but afterward, I couldn't open several key apps: MS Word, MS Entourage, Snapz Pro, Now Up-To-Date and TexEdit Plus. Nothing helped, repairing permissions, fsck -y, disk utility. I d/l'd 10.4.8 Combo Update, but it wouldn't work on my MBP, giving an error ("not compatible with this Mac" or something similar - and, yes, this was the "Intel" Combo Update). Since I need these apps, I finally had to do an "Archive and Install" with my MBP install DVD, and all the apps now work again. Since it took a full day of fixing, I'm unwilling to re-download/install this security update, hoping to see Apple make a new one. But they've uttered nary a word about problems with this update.
Anyone else have similar problems with Intel incompatibility with this security udpate?