Computer Science Job Market:
ACM CareerNews

Computer Science internships:
ACM Crossroads
Summer REU (Research Experience for Undergraduates) Research
Google Summer of Code

Professional organizations:
Association for Computing Machinery
IEEE

Computer news:
The Register
The Inquirer
Slashdot

Good stuff:
Windows NT/2000 FAQ
Windows Sysinternals
World Wide Web Consortium

Security:
Crypto-Gram newsletter
Computer Emergency Response Team (CERT)
SANS Institute
RSA Security
Microsoft Security