Microsoft published the technology preview versions of the newest service packs for the .NET Framework a few weeks ago, .NET Framework 1.0 SP3 as well as .NET Framework 1.1 SP1. This gives anyone the possibility for starting testing applications with the new SP versions (although of course I'd not suggest installing on production environments:-)). The previews are available at the following links and feedback can be posted at http://communities.microsoft.com/newsgroups/default.asp?icp=techpreview&slcid=us:

.NET Framework 1.0 Service Pack 3 Tech Preview:
http://www.microsoft.com/downloads/details.aspx?FamilyId=CF52CA95-F2CC-459F-87EE-C17D16E22F08&displaylang=en

.NET Framework 1.1 Service Pack 1 Tech Preview:
http://www.microsoft.com/downloads/details.aspx?FamilyId=12721880-CB9F-4481-9610-987DE96532E7&displaylang=en

.NET Framework 1.1 Service Pack 1 Tech Preview for Windows Server 2003: http://www.microsoft.com/downloads/details.aspx?FamilyId=DA1C20AD-35AE-4CEA-8451-730FCD603383&displaylang=en