IrfanView is the ONLY Windows program I haven't been able to leave behind. I have been using Ubuntu since 2006, but I don't think there is a Linux app that can match it. Irfan Skiljan, its creator, has taken care that IrfanView runs smoothly under Wine. The Windows icon for IrfanView is terrible, so here's the one I made for my own use. It should somehow match the Faenza icon set.