I and my colleague Govind Kanshi have been going around India talking about performance tuning as part of the Performance Clinic Workshop. The content for the workshop (decks + samples) have been posted in a Gotdotnet workspace called .NET Architecture Workshops. Please follow the link to register yourself with the workspace to download the content.
BTW, we also did SQL Server 2005 internals workshop and CLR internals workshop earlier. We will be posting the content for those workshops in the same workspace in the near future. Govind maintains an excellent blog that contains tons of pointer to interesting database related articles that formed the basis for our SQL workshop.
I am also looking forward to hear from you regarding the future workshops and the subject areas of interest to solution architects. Please use the 'Contact Form' to directly send an email to me. Thanks.