You can subscribe to the Secunia Weekly Summary mailing list by editing your Secunia Community Profile.
The Secunia Weekly Summary is sent out every Thursday and includes:
Word from Secunia
This Week in Brief
This Weeks Top Ten Most Read Advisories
Vulnerabilities Summary Listing
Vulnerabilities Content Listing
NOTE: This mailing list does not include information about updated Secunia advisories. You should note that Secunia on average issues more than 20 updated advisories per day, containing information about exploit and patch availability, new and in-depth research, and all other details that are relevant.