Some of my current work involves developing the Sakai portal and collaborating with others in this space. To keep abreast of what is happening I follow the SVN commit messages and have a filter setup in the Sakai bug tracking system (JIRA).
I filter the SVN commit messages (as I get notified of every single Sakai commit) so that I only see the ones that relate to the /portal part of the repository. My filter (GMail) for this is to:(source@collab.sakaiproject.org) (portal/trunk OR portal/branchces)
. In JIRA I have a filter which emails me any tickets that have changed in the last 24 hours and have it run once a day. The trick for this is to have the Updated From field set to -1d
This all allows me to know about stuff that is changing without being overwhelmed with email.