Another bucket of really good articles
Check Akadia if you want more .Net articles and code samples. Some are quite impressive.
You can also find stuff on Oracle, SQL Server and Windows.
The one I am reading currently is the SQL Server 2000 Survival guide. Cover almost everything on the administration side.
Filtering and sorting in ADO.Net is also a good example of a technical article. Very complete.
The list is long, so check yourself :-)