I have recently added a wiki page about the example workflows (as I think those are cool, but Google do not index them on the KNIME example server ;-) ). I guess it could be improved a lot. Feel free to edit. (I guess it is already a bit large, so if there is a workflow you would like to share and it is not in the KNIME public server I guess another wiki page might be a good idea.)
There were some workflows which do not have metadata, if you have used it and know what it is about, please add a description.
It might be useful for the users if some of the workflows were available as a separate wiki page with more detailed description, or even a screenshot. What do you think?