ISA SSL Capacity Planning
I don't really blog much about ISA, but I thought the following link is extremely useful if you're deploying Exchange with OWA and/or RPC over HTTP. Both of which requires SSL in a production environment. If you have ISA as a part of that mix, then this article is a MUST READ!!
http://www.microsoft.com/technet/prodtechnol/isa/2004/plan/ssl_performance.mspx
[Found out about this via another blog post: http://weblogs.asp.net/Squasta/archive/2005/01/28/362346.aspx]