So by now you should have your Windows Small Business Server Service Pack 1 CDs, and if you're a Premium customer, that means you have your ISA 2004 installation CD!
I know if you're running Premium, you probably don't need incentive to upgrade from ISA 2000 to ISA 2004, but heck, I'm going to give you one anyways!
The ISA 2004 client makes networking so easy! Let me tell you why. I have been running the ISA 2000 firewall client since I started my job at Microsoft. Frustrated by not being able to use my "connected" internet connectivity at my house until I disabled the firewall client, then getting back in the office and having exactly the same problem until I enabled the darn thing.
What a Pain!
Lucky for me, without even asking the ISA team to do this, the new ISA 2004 firewall client now is able to detect the network your on and let data through when the ISA 2004 cannot connect to the firewall. No more searching for that icon in my system tray to turn it on or off! Yeah!