Another question (I've searched full topic, no found, but no extensive read)

I've one worker with very few power (0.6MH/s)
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Bat.user    xxxxxxxxxx    0    0    0    2011-06-03 06:05:40    Edit | Delete

I've started minning yesterday and share is 0
What are the share ? Is it normal it stay to 0 ?

5068    2011-06-03 10:29:48    0:40:22    381928    none    128334    100 confirmations left
5067    2011-06-03 09:49:26    1:15:40    715704    none    128330    96 confirmations left
5066    2011-06-03 08:33:46    0:34:20    321857    none    128324    90 confirmations left
5065    2011-06-03 07:59:26    0:45:58    416687    none    128321    87 confirmations left
5064    2011-06-03 07:13:28    0:02:35    21744    none    128309    75 confirmations left
5063    2011-06-03 07:10:53    0:39:17    364832    none    128307    73 confirmations left
5062    2011-06-03 06:31:36    1:20:22    744355    0.00000579    128302    68 confirmations left
5061    2011-06-03 05:11:14    0:26:58    245964    0.00000687    128292    58 confirmations left
5060    2011-06-03 04:44:16    0:16:03    145454    none    128287    53 confirmations left

For a lot of block there is no reward ? What's the point ? There is a minimal amount under there is no reward at all ?
Or it is related of full block processing ?

Thanks in advance !