Just gone live is Service Pack 1 for Small Business Server SP1. This builds on the Service Pack 1 release for Windows Server 2003, but is tuned more specifically to the overall capabilities of SBS and introduces some additional features in this really neat product.

In addition to Windows Server 2003 SP1, you now get:

Exchange 2003 SP1
Windows Sharepoint Services SP1
Outlook 2003 SP1
and Windows XP SP2

The premium edition also gets ISA Server 2004 which is a really great product and SQL Server 2000 Service Pack 4.

Here's the links you need:

What's new for SBS2003 with Service Pack 1
SBS Home page on Microsoft.com 
Landing page for SP1 download  You can also order a service pack CD from this link (approx 6-8 weeks for UK, 1-2 weeks if in North America).

Note: Before you say (and I'm sure you will), I've just tried downloading SP1, and it does currently fail - I've reported it and hopefully it will be resolved very shortly. A little patience and I'm sure things will be resolved :-)