Sorry if this is just common knowledge and nothing can be done.
but, why is it that 'uncompressed' filters use the feature effectively and are not constantly downloaded, but on the same URL some 'compressed' file are downloaded regardless if there new or not.
E.G.
http://update.transmissionbt.com/level12010-10-27 12:18:45: Successfully updated ipfilter.dat
2010-10-27 12:18:45: Loading IP filters 'ipfilter.dat' and 'ipfilter_static.dat'.
2010-10-27 12:18:45: Loaded 224876 IP-ranges from '/home/gav/.aMule/ipfilter.dat'.
2010-10-27 12:18:46: Loaded 0 IP-ranges from '/home/gav/.aMule/ipfilter_static.dat'.
2010-10-27 12:18:46: IP filter is ready
2010-10-27 12:18:58: Skipped download of ipfilter.dat, because requested file is not newer.
http://update.transmissionbt.com/level1.gz2010-10-27 12:18:45: Successfully updated ipfilter.dat
2010-10-27 12:18:45: Loading IP filters 'ipfilter.dat' and 'ipfilter_static.dat'.
2010-10-27 12:18:45: Loaded 224876 IP-ranges from '/home/gav/.aMule/ipfilter.dat'.
2010-10-27 12:18:46: Loaded 0 IP-ranges from '/home/gav/.aMule/ipfilter_static.dat'.
2010-10-27 12:18:46: IP filter is ready
2010-10-27 12:18:58: Skipped download of ipfilter.dat, because requested file is not newer.
2010-10-27 12:26:59: Successfully updated ipfilter.dat
2010-10-27 12:26:59: Loading IP filters 'ipfilter.dat' and 'ipfilter_static.dat'.
2010-10-27 12:27:00: Loaded 224876 IP-ranges from '/home/gav/.aMule/ipfilter.dat'.
2010-10-27 12:27:00: Loaded 0 IP-ranges from '/home/gav/.aMule/ipfilter_static.dat'.
2010-10-27 12:27:00: IP filter is ready
2010-10-27 12:27:37: Successfully updated ipfilter.dat
2010-10-27 12:27:37: Loading IP filters 'ipfilter.dat' and 'ipfilter_static.dat'.
2010-10-27 12:27:38: Loaded 224876 IP-ranges from '/home/gav/.aMule/ipfilter.dat'.
2010-10-27 12:27:38: Loaded 0 IP-ranges from '/home/gav/.aMule/ipfilter_static.dat'.
2010-10-27 12:27:38: IP filter is ready
And BTW It's not updating it because there's a new version, notice the time in the logs.