Kimberly Tripp - SQL Goddess
She is really good in SQL and I recommend her blogs and webcasts if you want to understand some of the gotcha’s & optimizations in SQL Server. I learned about her from .NET Rocks back in the day.
http://www.sqlskills.com/blogs/kimberly/
Here are some entries specifically for SharePoint
http://www.sqlskills.com/BLOGS/KIMBERLY/category/Sharepoint.aspx
Transaction Log entries
http://www.sqlskills.com/BLOGS/KIMBERLY/category/Transaction-Log.aspx
Here are some webcasts
http://www.sqlskills.com/BLOGS/KIMBERLY/category/TechNet-Webcasts.aspx