• Petr Lapukhov continues to write interesting stuff: recently he's covered WRR queuing parameters on Catalyst 3550, wrote an introduction to SNMPv3 and provided sample private VLAN configurations.
• Joe Harris discovered an interesting feature in IOS release 12.4(20)T: you can increase the Fast Ethernet interface MTU way beyond the 1500 bytes, making it easier to implement various MPLS solutions in switched LAN environments.

Browsing through the starred articles in my FeedReader, I also found two older articles:

• Brian McGahan describes the IP Multicast helper-map feature.
• Arden Packeer writes about 6to4 tunnels.