Recently I have had little time to devote to blogging, but I did want to pass along a couple of references that I tend to provide to customers, partners, and Microsoft internal folks as they dig deep into SSRS.
Robert Bruckner has a great blog which offers many tips on SSRS, especially focusing on report processing. The topic I tell customers to reference most often is how to use the ExecutionLog2 View for analyzing and optimizing reports.
Dean Kalanquin has just started a new blog. He's a old time SQL guy who can craft any SQL Query you can imagine. He's started a blog and has created a post on how to diagnose and trouble shoot subscriptions which I think would be very helpful, especially to those who have read my previous posts on subscriptions management.
Take care and good luck,