Well...About all we know from the recent Galileo flyby in June- July 1996 was that the surface features strongly suggest a thin crust a couple of kilometers thick in some places. The 'highway' striping that runs along numerous faults on the crust LOOKS like it could be due to water that erupts as geysers and blankets the cracks in snow. It SEEMS plausible that the interior is a liquid of some kind otherwise there would be no surface tectonic plates as there do appear to be in the photographs. We do not know the age of the crust, but it seems to be young based on how few craters are present. So, let's be generous and assume we have crustal ice plates riding over a subsurface 'sea' of water. Does this mean life? Of course not. All it means, convincingly, is that Europa may have lots of liquid water, so that it's interior is warm enough to be in an interesting temperature range for organic molecules. There is no evidence for any unusual coloration changes in the surface 'snows' that suggests organic molecules are actually present below the surface. Don't forget that Jupiter and Titan are filthy with organic molecules, and these bodies are colorful ( well...Titan is pretty bland but at least it is not pearly white like the snows of Europa). My opinion is that if there are organic molecules in Europa, they are well below the surface and present at pressures that may make fragile organic molecules like DNA or RNA impossible to form.