I analyzed the recent 10,000 PoW blocks by reward receivers' address.
Starting block: 449135 time: 1405946068 (2014-07-21 08:34:28)
Ending blcok: 505716 time: 1407001485 (2014-08-02 13:44:45)
Total PoW Blocks: 10,000
Total Seconds: 1055417 seconds
Seconds per PoW Blocks: 105.54 Sec
(It seems shorter than the 120 sec specification, but maybe due to the previous PoS bug)
PoW Finder by reward address
dwarfpool 'JdaWQx5PCseQUB96FUZ4vALkfPYFUzVG6U', 5205
hashharder 'JdFS2tsvviiLCQmZe6u7LVfuYQCEptewwc', 181
cloudminers 'JMwAa9rmHZ4skBoNUT5CTMxPT64apNuRaQ', 13
miningpoolhub 'JS3omrhUAtRs2vWkqt8TCoicbaJbPQ4Szf', 2405
hash@me 'JVkiH5LUg74NcxkhoJm4fCqMoFNspQ8J2R', 509
Unknown 1687
total 10000 blocks
This statistics shows dwarfpool occupies at least more than 50% of PoW hash powers.
There was miscalculation on the total number of PoW blocks.
Starting block: 449135 time: 1405946068 (2014-07-21 08:34:28)
Ending blcok: 505716 time: 1407001485 (2014-08-02 13:44:45)
Total PoW Blocks: 8584
Total Seconds: 1055417 seconds
Seconds per PoW Blocks: 122.95 seconds
(more close to 120 sec spec)
The dwarfpool's share is 5205/8584 = 60.63%
'total', ' ', 8584
'JdaWQx5PCseQUB96FUZ4vALkfPYFUzVG6U', 'dwarfpool ', 5205
'JS3omrhUAtRs2vWkqt8TCoicbaJbPQ4Szf', 'miningpoolhub ', 2386
'JVkiH5LUg74NcxkhoJm4fCqMoFNspQ8J2R', 'hash@me', 509
'JdFS2tsvviiLCQmZe6u7LVfuYQCEptewwc', 'hashharder ', 180
'JLMmag6g1UMGue6eRhfkp1WEgaBb74oWTo', '', 40
'JKFwyyqUSsk5pC7D73nm1PtJZQ7mv2ejiM', ' ', 25
'JRvLq5zF2mucxPXa8Ea7vHArfFVDc6SQ15', ' ', 23
'JeV8nKBaTYxMrBV3amUnPrpwxuVq3Tg9Kd', ' ', 20
'JQyrj9X4YDz7od7yyCuqKcR5CjDHgsshL8', ' ', 19
'JeE8dUs3ZcaigVJVm7Jkt9z7GGPHNDcGWJ', ' ', 18
'JWgag6zK46wsStg9BT83Abroo3psBH2h5P', ' ', 17
'JPknnDxeCP3k1r3pg2KtTiF2FTUsFnxGSX', ' ', 13
'JKwkKoZwd8VwnktjyD946KdwXFw9MFRKZD', ' ', 11
'JPm84bNDXRKpzkuXUBm2KS7AVagauirNYD', ' ', 11
'JZaS6Z5i7m499JJ3cpyF63FV9g7TBi77wX', ' ', 10
'JcFEnWnkWjwGUequj4BEGUYGgX2rDjko6x', ' ', 10
'JMwAa9rmHZ4skBoNUT5CTMxPT64apNuRaQ', ' ', 9
'JSXMryRQZBa6t6qFaCpxEX6aRgL3MsZZGa', ' ', 9
'JZBvDgncyfeMEL7GFKrZf421sjLkF17Bhz', ' ', 9
'Je8LNooNxgZX4yupU1upuHshc4mYHssLCv', ' ', 8
'JhFgyd5KNJ4YwY2zR2RGHBGqD657yFhXvh', ' ', 6
'JTg4KfgKaeYt4mh9aZGJjK6cPvABMooPGG', ' ', 5
'JK6v8qZWJjG4b6ziBC54LSn4pQ4MvWsEnh', ' ', 5
'JTmPV5Js5CGmuiNnbPgpDtLU7wrhyuRhmR', ' ', 4
'JNSJdZtjeULditYfeTvqrztEeb8wsBwBGp', ' ', 4
'JMP7T3yZRWDH2YWi54TUzY8mnZScKB8mft', ' ', 4
'JZ9d6db7VZvnHRrb2jTu3DRNwPzrn72aMy', ' ', 3
'JLxmPKKYiaVbcAjw771yvNHgphVVD6e6ax', ' ', 3
'JeReBiAhjrFrvmZSbJESoUTRRMcFFK6u9f', ' ', 2
'JYU6YkLb6fSLTR1UiQDCHgebbsxLnFJs1g', ' ', 2
'JhDMUqZfmZ2m58twrWXMHMwNX1YGNCotGy', ' ', 2
'JhpB5jt3edmfWQgte65i28qZSZi7nWKYPT', ' ', 1
'JbSMYsJVYepaQVLiz53CFCxKfQKAZd8MPn', ' ', 1
'JLnMhfEzovWo1xbzU3RWC6uwkQjsbd7yXJ', ' ', 1
'JRhFiUHxAms6r9kX6DnQLVMFqCFUWo5vKb', ' ', 1
'JboFA8mKKVcTBVVpRjqcRw4np3kLr5tCDm', ' ', 1
'JNhUJkJAJU47r6pjC4t9eoGr1vxTJDUuFm', ' ', 1
'JaXGFo5GsizWEBeohfmxFRYmPhpYvBDgN8', ' ', 1
'JTaR4pVDPZyLPL1CoWNw8skGS1XfdacQTW', ' ', 1
'JgCCxtVsrH6UU33tztqePy3AkaobMF2wVP', ' ', 1
'JQLmdLJpqenH68weupBjt7rbGewYKdWKKm', ' ', 1
'JaSvgSEQZzskhULPiweumcfXnZ5GnvAttX', ' ', 1
'JUshREvuiKwqs9xdRJFirG3rTiKNeHdD5q', ' ', 1