For the last three years, I've been working at e92plus as the Technical Manager. We have a portfolio of products, some have gone since then, some new ones have come, but the one I took a shine to was Celestix.
Celestix make hardened Windows appliances that run Microsoft ISA Server, and Microsoft IAG Server.
I have been a Microsoft Certified Professional (MCP) since 1998... (yes, I'm that old and then some!) and have worked with NT3.51 through to Windows 2008.
It seemed like the logical step for me to take the Celestix product range under my wing.
I started playing with Windows ISA 2006 nearly three years ago, but a majority of these deployments have been as a proxy and cache, but have seen the other flavours as well.
Any way the point of this post is to list the useful resources that have helped me along the way:
http://www.isaserver.org/ - A proper ISA guru - Thanks Tom! :)
http://blog.msfirewall.org.uk/ - Jason Jones of Silversands is an MVP based in the UK
http://tmgblog.richardhicks.com/ - Recently I meet Richard Hicks of Celestix, and this is his blog