Looks like your CPU is just too slow to do any work before you get a new block.
Yeah, the CPU is
WAY too slow to be at deepbit. New blocks are being found before you can hash out any shares.
With my 23Mhash/s I was lucky enough to get 5-10 shares per block.
Try a smaller pool (
http://forum.bitcoin.org/index.php?board=41.0 ) with something like less than 100Gh/s to test your CPU.