Do you mean 25mm? Arguably the best small compact is Ricoh's GR1, not cheap but consistently well reviewed. Not a zoom though. The R1 is good too, I use one as a climbing camera.
For SLRs, Minolta make one which is claimed to be the world's lightest. I've forgotten the name/number, but sold by the likes of Jessops, www.jessop.com I think.
