Plan for software boundaries (Office SharePoint Server)

From technet.microsoft.com

Estimate performance and capacity requirements (Office SharePoint Server),Plan for software boundaries (Office SharePoint Server).

This article provides information to help you understand the tested performance and capacity limits of Microsoft Office SharePoint Server 2007, provides information about the test environment and test results, and offers guidelines for acceptable performance. Use the information in this article to determine whether your planned deployment falls within acceptable performance and capacity limits.

http://technet.microsoft.com/en-us/library/cc261716.aspx

http://technet.microsoft.com/en-us/library/cc262787.aspx

Enhancing the SharePoint sites

Those links below are related to enhancing the SharePoint sites, caching, disposing objects and all about memory leaks, optimize SharePoint sever indexing, enhancing camel quires, content query web parts and such and such.

Blob cache:
http://office.microsoft.com/en-us/sharepointserver/HA101762841033.aspx

IIS compression:
http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/d52ff289-94d3-4085-bc4e-24eb4f312e0e.mspx?mfr=true

SharePoint best practices:
http://msdn.microsoft.com/en-us/library/aa973248.aspx

Configure page output cache settings:
http://office.microsoft.com/en-us/sharepointserver/HA101206861033.aspx

MSDN References:
http://msdn2.microsoft.com/en-us/library/aa973248.aspx
http://msdn2.microsoft.com/en-us/library/bb687949.aspx
http://msdn2.microsoft.com/en-us/library/aa973248.aspx
http://msdn.microsoft.com/en-us/library/ms413145.aspx?PHPSESSID=7c61ntavm1dmu84rl10kephll5
http://msdn.microsoft.com/en-us/library/aa505327.aspx
http://msdn.microsoft.com/en-us/library/ms947783.aspx
http://msdn2.microsoft.com/en-us/library/bb727371.aspx#MOSS2007OptPerfWCM_OverviewofPerformanceOptimizationforWCMSites

Forums, blogs, articles and other websites:
http://www.binarywave.com/blogs/eshupps/Lists/Posts/Post.aspx?List=9c93c708%2De5ce%2D4714%2Dbdea%2D499330361130&ID=111
http://blogs.technet.com/stefan_gossner/archive/2007/11/26/dealing-with-memory-pressure-problems-in-moss-wss.aspx
http://blogs.msdn.com/joelo/archive/2007/12/05/10-things-to-optimize-your-sharepoint-server-indexing.aspx
http://www.ranjanbanerji.com/techtalk/20070716.aspx
http://blogs.msdn.com/tess/archive/2006/09/06/net-memory-usage-a-restaurant-analogy.aspx
http://support.microsoft.com/default.aspx/kb/933560
http://jritmeijer.spaces.live.com/blog/cns!8A48A27460FB898A!965.entry?wa=wsignin1.0

Violation of PRIMARY KEY constraint 'PK_OrderForms'. Cannot insert duplicate key in object 'dbo.OrderForms'

This may happens because a multiple users logging in and checking out under the same userid/password at the same time so same basket this may cause a corrupted basket,

any way find the solution here !

http://social.msdn.microsoft.com/Forums/en-US/commserver2007/thread/898b5886-cb62-44d6-b64b-de719faf5b84/