Thanks to the Microsoft Download Center Feed from http://www.thundermain.com/ I noticed that the Service Packs for the .NET Framework have been put online.
The fixes are listed in the KB articles linked to the download pages.
The primary focus of Microsoft .NET Framework 1.[x] Service Pack [x] (SP[x]) is improved security. In addition, the service pack includes roll-ups of all reported customer issues found after the release of the Microsoft .NET Framework 1.[x]. Of particular note, SP[x] provides better support for consuming WSDL documents, Data Execution prevention and protection from security issues such as buffer overruns.SP[x] also provides support for Windows XP Service Pack 2 to provide a safer, more reliable experience for customers using Windows XP.