My full list is here: Neelixx's Tech Blog Reading

Datacenter

• Brad Hedlund
• Cisco Datacenter
• Inside the Datacenter - HP Blogs

Networking (Data)

• Packet Pushers
• EtherealMind
• In Search of Tech
• Aaron Conaway
• IOS Hints
• KontrolIssues
• Networking Guru
• Networking Nerd
• PACKETattack
• Packet Maniac
• PacketLife.net
• PacketQueue.net
• SteveRossen.com
• Router Jockey
• HP Networking Blog

Networking (Wireless)

• Revolution Wifi
• Jennifer Huber

Networking (Voice)

• CCIE Voice Guide
• Another Day at the Office

Systems (VMWare, UCS, Server)

• The Lone SysAdmin
• Virtualization for Service Providers