Last Tuesday Microsoft announced the new generation of IAG, now called UAG (Unified Access Gateway). For more information check the Forefront Team Blog site:

http://blogs.technet.com/forefront/archive/2008/04/29/microsoft-announces-its-next-generation-secure-remote-access-solution-the-forefront-unified-access-gateway.aspx

…or the UAG page:

http://www.microsoft.com/forefront/prodinfo/roadmap/uag.mspx

Keep watching the evolution of this product; it is becoming ever more powerful, secure and flexible.