Michael has posted a great list of modelling links on his blog. I hadn't realized Ramesh Rajagopal was blogging. Ramesh works on the class designer I blogged about last week.
Michael also has links to MSFT's Dynamic Systems Initative. Since I came from the developer camp, I usually focus on application architecture. DSI is going to be crititcal to infrastructure architecture. We have a section on infrastructure architecture on the Architecture Center that includes more info on DSI.
Update: Michael linked to a two part interview with Keith about the Whidbey modelling tools. Highly recommended.