Favorite Image Viewer?

Which do you like better, IrfanView or XnView? I like XnView's tabbed interface, i.e. browser and multiple images in one window rather than IrfanView's tumbnails and images all in separate windows. However, IrfanView jsut seems easier to use, I dunno.

GQview?

Man, some people wouldn't know bad UI if it gang-raped them in a back alley repeatedly.

And it doesn't handle animated gifs either, even though the underlying libraries do. lol 1995