If you haven’t explored the tools and projects going on in Codeplex around SharePoint I would strongly encourage you to take a look. There is a wealth of great accelerators, ideas and useful tools that can save you a lot of time when developing SharePoint solutions. Codeplex – SharePoint
One of my ‘must have’ tools is SharePoint Manager 2007. This tool is a SharePoint object model explorer and enables you to browser every site on your local farm and view every property. You can even change the properties via the tool which can be a great time saver. Every spent time creating quick and nasty console apps to make some changes to your SP configuration. I know I have!
I also find this a great tool to quickly audit a new SharePoint farm and get a quick glimpse of the sites, app pools etc in use.