I have come to the conclusion that any pool that does not provide a blockexplorer link to each and every block found by the pool is most likely doing something underhanded.
I would even go a step further and say pools not being transperent with their miners, has something to hide. Still can't even get past the fact that slush's pool does not even offer its miners stats on how many shares per block they mined.
I mean seriously why not just call yourself Hushpool