The existence of the OSS-Security Community was announced last week. If you're interested in the unique challenges that Open Source software faces with respect to security, feel free to join the discussions within the group. As all communities go, the idea here is to grow a self sustaining community, not something that's just a few people doing all the work.
There were rumblings of a 0day Flash Player flaw in the wild. It turned out to be unpatched copies of Flash Player as noted on the Adobe Product Security Blog. This is just another example of why it's very important to keep your system updated properly.
Initially this was thought to be quite minor, until it was noticed that it's possible for a Samba server to connect back to a client when doing certain printing actions. This means that this particular Samba client issue also affected the server. Quite tricky.