Finally my first codeplex project is finished: http://wsplistener.codeplex.com/

Super easy copy paste installation of WSP files on different servers in your OTAP environments.

The WSP listener is a windows service application which waits for new config and WSP files in a specific folder. If a new config and WSP file are added, the WSP Listener will install the new SharePoint solution on the server based on values in de config file. The config file is a configuration file (for example MySharePointSolution.wsp.config) which defines the settings for the installation of the WSP solution file.

All feedback is welcome, hope this tool helps improvethe efficiency of your deployment