Once you've installed MOSS 2007 you'll notice there are heaps of web parts and making it easier for Portal Admins to find the web part to add can be made easier by "idiot-proof" naming and also grouping the web parts into sections.

 C-Dog has a great article on this which also covers how to automate what group a web part gets added to by using features and editing the .webpart manifest file. It also covers Code Access Security for web parts too and how to wrap this up and deploy it.