Just want to point you to a few blog articles I have read recently just in case your search doesn't reveal them or if you are lacking a bit of reading material...
Introducing a New Era for ISA Server (interesting info about FTMG [Forefront Threat Management Gateway]) A Look at Threat Management Gateway Troubleshooting OWA 2007 Publishing Rules on ISA Server 2006
I know everyone reads the exchange team blog but this is worth pointing out - very useful bit of information for enterprise customers spec'ing Hub Transport Server (New maximum database cache size guidance for Exchange 2007 Hub Transport Server role)
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If you're a blogger 12 Tools and Techniques for Building Relationships with Other Bloggers 12 Traits of Successful Bloggers Leave a Good Impression with Your Blog Posts
..and where's DPM?
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