I believe the only reasonable use of GIFs today is to use for all kinds of 1px gradients for background where you can't use CSS3 for that. And even if image is big - it might be better off with PNG.
basically, if you use just few colors and no semi-transparency and you picture is small - yo might be better off with GIF, otherwise - either PNG or JPG depending on if you need semi-transparency or not, and if you need loss-less compression or not.
basically, if you use just few colors and no semi-transparency and you picture is small - yo might be better off with GIF, otherwise - either PNG or JPG depending on if you need semi-transparency or not, and if you need loss-less compression or not.