I developed a test web part and everything worked well. Now I try to deploy another webpart without using GAC (several websites, including Microsoft's, say that the web part dll must either be in /bin folder or in the GAC).
Now, when I copy the dll of the webpart into the /bin folder, it is not shown in the available webparts in SharePoint 2010.
A restart of the server didnt work, nor adding it to the web.config.
How can the webpart be registered to SharePoint?