Hi,
I am afraid I also cannot give too much advice here. From my point of view, the free web based solutions like Pentaho / Jasper mainly are able to deliver table based reports but this is of course far from reporting arbitrary data mining results. The RapidMiner Enterprise Edition includes a full reporting engine which is also able to include user comments but it is of course neither web based nor independent of the concrete data mining solution (it has to be RapidMiner). But it could be worth to have a look into the Enterprise Edition anyway since it at leasts supports the reporting from arbitrary plots, graphs, models etc. and of course
also tables

Cheers,
Ingo