I personally find the newer system for ranking having quite a big drawback and that is that old maps that are still very much great are mostly ignored in favor of quite often mediocre newer maps. I would suggest some sort of hall of fame for the best older maps to make those good old ones count.
One way of making such a hall of fame is by voting just like with the best of 2012 and 2011 but this time you can vote for all the ranked maps ever made for osu! as long as they are at least 12 months old. Those 100 maps may be re voted at any time and can change dynamically with votes being changed and new votes being added. the maps themselves are weighted for pp as if they where new maps. Alternatively it could change on a monthly or yearly basis to prevent maps that where counted before are suddenly gone the next day.
One way of making such a hall of fame is by voting just like with the best of 2012 and 2011 but this time you can vote for all the ranked maps ever made for osu! as long as they are at least 12 months old. Those 100 maps may be re voted at any time and can change dynamically with votes being changed and new votes being added. the maps themselves are weighted for pp as if they where new maps. Alternatively it could change on a monthly or yearly basis to prevent maps that where counted before are suddenly gone the next day.