The module -BopComments- offers a page & block that displays newly information on the entire site inclusively.
By adding proper plug-ins, you can extend this module.
The recent version 0.6.1 of BopComments can output RSS too.
You can download from Finalgear
Of course, this module is friendly to piCal!
Included plug-ins:
B-wiki
myAlbum-P
myDownloads
myLinks
newbb
news
piCal
system (comments)
wfsection
FAQ
Poll