Google Images
Google Search (US is highest, but I also get steady traffic from UK and Aus)
Gather
Blogger
Bloggeries is also in my top 10, so yay.
The list below the top 6 really varies from month to month. Like the time when I was testing out Stumble, my traffic jumped majorly during those days, but there was no extended long-term return, so I don't use it. It's great for the numbers, but I don't have the time to put in tons of time for something that doesn't last or really convert.