I'm currently working on an update to Googlebar Lite, and I'm debating whether or not to drop some of the more outdated locales. I wrote a Perl script to gather some data about the locales, and this is what it reports as of my current development snapshot:

Locale   Matches   % Match   Missing   % Missing
------------------------------------------------
 en-US       172   {Master Locale}

 ca-AD        24     14.0%         6        3.5%
 cs-CZ        12      7.0%         0        0.0%
    da         7      4.1%         0        0.0%
    de         8      4.7%         0        0.0%
 el-GR        32     18.6%         6        3.5%
 es-ES         4      2.3%         0        0.0%
 et-EE        14      8.1%         6        3.5%
    fr        13      7.6%         6        3.5%
 hr-HR        31     18.0%         6        3.5%
    it        23     13.4%         6        3.5%
 ja-JP         9      5.2%         6        3.5%
    nl         8      4.7%         0        0.0%
    pl         6      3.5%         6        3.5%
 pt-BR        31     18.0%         6        3.5%
 ru-RU        22     12.8%         6        3.5%
 sk-SK        32     18.6%         6        3.5%
    tr        30     17.4%         6        3.5%
 uk-UA         5      2.9%         0        0.0%
 zh-CN        30     17.4%         6        3.5%
 zh-TW        11      6.4%         6        3.5%

The 4 locales most out of date are el-GR, hr-HR, pt-BR, and sk-SK. Those are currently the ones I'm considering tossing out, but I also could make a case for tr and zh-CN. My non-scientific rule of thumb has been that I toss out locales that get to be more than 20% out of date (meaning that a sum total of 20% of strings either match or are missing). I'll give this a few more days to think about it. Do you have any ideas as to what I should do? If so, feel free to leave a comment below.