If you want to keep current in the latest in data warehousing thinking, I recommend the following sites where you do not have to pay or register to access most of the information:
DBMS2 – Probably the best data warehousing news source there is.
Intelligent Enterprise – Great online magazine with coverage of data warehousing.
BeyeNetwork Articles – The non–commercial part of this huge site.
Neil Raden’s Articles – Great insight from a guy who has been working in the field for a long time.
BI Blogs - Pulls articles from a variety of blogs of varying quality but nevertheless is informative.
Kimball Group Data Warehousing Articles - Intelligent writings from Ralph Kimball and his associates.
Peter Thomas Blog - Intelligent blog from another industry veteran.
Alltop Business Intelligence - Links to business intelligence blogs, articles, news sources.
Open Source Solutions - Provides great information on open source business intelligence.
Visual Business Intelligence - Is a provocative, excellent blog by Stephen Few.
Rattling - Is a blog by Barney Finucane.
Also, there is an active data warehousing/business intelligence community on Twitter. Some of the persons who participate are listed here.