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LES: There must be some mistake above. While bzip2 is indeed the strongest compression format and produces the smallest files, I've also found it to be one of the slowest formats. It's usually twice as slow as other formats, not twice as fast.DLR It refers to twice as fast as PPM compressors (reference ones). For day-to-day usage I find the difference in speed negligible compared to the substantial savings in space (relative to gzip compression).LES: Hard disk drives get cheaper and space is more abundant every month. Time has only become scarcer therefore more precious ever since I was born.KPV: Yes, but network transmission speeds are still such that the smaller size more than offsets the slower compression time, especially for offline static stuff.DLR Yes, I routinely get about 20% savings relative to gzip, which can mean a lot if you are on a modem line or your files are big. Not the same downloading 1Gb or 800MB. Once all we have T3 data lines coming into our homes, maybe ;)HJG And don't forget those people without a flatrate, who have to pay for their traffic-volume...wdb By my opinion: Either compactness matters. Then take the best format available. Or it doesn't. Then, don't zip at all.