Blogs
Brent Ozar - http://www.brentozar.com/
The Future of Monitoring - http://www.thefutureofmonitoring.com/
Power Scripting - http://www.powerscripting.net
Other
SQLBits - http://www.sqlbits.com - SQL Server professionals in the UK
ASK SQLServerCentral - http://ask.sqlservercentral.com/ - get your SQL Server questions answered here.
ServerFault - http://serverfault.com/ - more SQL professionals helping you with your problems and questions, for free!
Software
RedGate Software- Ingeniously Simple Tools for any busy DBA
PowerShellAnalyzer - The best way to edit your PowerShell scripts, that I have found.
LogParser - A brilliant tool for extracting, handling and monitoring files of all types
Virtual Box - my preferred virtualisation tool.
Reading
Grant Fritchey - SQL Server Execution Plans - details
Brad McGehee - Brad's Sure Guide to SQL Server Maintenance Plans - details
SQL Server MVP Deep Dives by Paul Nielsen (Author), Kalen Delaney (Author), Adam Machanic (Author), Kimberly Tripp (Author), Paul Randal (Author), Greg Low (Author) - details