There are several issues fixed by a bundle of updates for OS X (for 10.4 up to 10.4.6). The new release is 10.4.7 There are a number of issues fixed in addition to at least 3 security related problems. Incidents.org has more details. I know many Mac users feel the “aura of invincibility”, but…. keeping your OS updated is important no matter what Operating system you use…. mac, windows, linux, bsd, etc.