I wrote this little SharePoint Solution to enable the uploading and upgrading of Solutions through the Central Administration of MOSS 2007.
Use the DeploySolution.bat file on your moss server to deploy this solution. After this step you’ll never need to deploy a solution through stsadm!
Download the solution here: TamTam.SharePoint.SolutionManagement.zip (9.67 KB)
The solution adds a Farm Feature:
Enable it to get access to the new solutions management (Central Administration -> Opperations:
And upload or upgrade any other new solution: