All of my hobby and non-profit work is done with Open Source tools. When it comes to small business clients I use Microsoft Sql Server 2000+.
I keep track of the links, tools, and concepts that help me stay relevant on my wiki -> http://wiki.drybydesign.com/index.php?title=SQL
You can hop into #sql, or ##mssql on Freenode (IRC) and ask me a question or just converse about the SQL standards.