Best Practices: Common Coding Issues When Using the SharePoint Object Model

http://msdn.microsoft.com/en-us/library/bb687949(v=office.12).aspx

Working with AllowUnsafeUpdates()

Working with AllowUnsafeUpdates()

http://hristopavlov.wordpress.com/2008/05/16/what-you-need-to-know-about-allowunsafeupdates/
http://hristopavlov.wordpress.com/2008/05/21/what-you-need-to-know-about-allowunsafeupdates-part-2/

Page - Best Practices

http://www.aspfree.com/c/a/ASP.NET/ASP.NET-Life-Cycle-and-Best-Practices/

Debug vs Release Mode DLL

http://novatecno.blogspot.de/2010/04/increase-sharepoint-performance-retail.html

What's in the Temporary ASP.NET Folder?

Here - http://msdn.microsoft.com/en-us/magazine/cc163496.aspx

SharePoint Logs

How do I troubleshoot SharePoint? So many logs!

Timer Jobs in SharePoint

Step - By - Step Procedure
Andrew Connell's Post
Timer Scope and Lock