Skype has released Skype 184.108.40.2067 to block a critical vulnerability related to receiving a malicious file via an instant message. Also resolved are problems with video freezing in networks with high packet loss, and unspecified minor bugs. Unfortunately, the horrid design of Skype 5 remains in place, but, luckily, the still-functional Skype 2.8 does not suffer from Skype 5’s security vulnerability. So, you can either upgrade to Skype 220.127.116.117 or stick with (or downgrade to) Skype 2.8. I recommend downloading manually; the automatic updater failed when I chose Skype > Check for Updates. (Free, 20.2 MB)
Editing iCal Events in Snow Leopard
Snow Leopard makes looking at event details in iCal easier. In the Leopard version of iCal, you had to double-click an event to reveal only some information in a pop-up box; you then needed to click the Edit button (or press Command-E) to edit an item's information. In Snow Leopard, choose Edit > Show Inspector (or press Command-Option-I) to bring up a floating inspector that provides an editable view of any items selected in your calendar.
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So as long as you have one of them, you should be fine from a security standpoint.