The Sharepoint Manager 2007 is a tool you can't do without when developing Sharepoint. You can find the download here. The description from the author:

The SharePoint Manager 2007 is a SharePoint object model explorer. It enables you to browse every site on the local farm and view every property. It also enables you to change the properties (at your own risk). This is a very powerfull tool for developers that like to know what the SharePoint holds of secrets.