Not too long ago I released a set of Windows Azure Design Pattern Icons, which are related to my Windows Azure Design Patterns web site and upcoming Windows Azure architecture book (Volume 2 of The Windows Azure Handbook series).
Since making these icons available for download, I've been gratified to see many people using them. I've also had some requests for something that is resizable. I've gone ahead and updated the icon download zip file to also include Enhanced Windows Metafile (.emf) files that you can resize nicely in tools like PowerPoint and Visio. As you can see from the example below, this vector format allows you to resize these icons without pixellation.