From Lokas Software:
An icon collection from the developers of a well-known icon editing program. They offer several icon sets but we've chosen 'Realistic' because of its Windows Vista look. These icons will look up-to-date for the next 5 years. The collection comes with full vector sources. This allows you to construct new icons without being an artist. Their icon sets constantly grow. When you buy an icon set from them you receive all updates for free.