Its is possible to add keyword monitoring on groups in your Google alerts. “Subscribing to what could be hundreds of mailing lists is a daunting task”
It monitors the top 50 most recent Google Groups search results that relate to keywords you’re interested in. Any new articles posted that match your criteria will be emailed to you, just like Google News alerts. The ideal candidates for Groups Alerts are those that might be discussed in multiple discussion groups. Give it a try and see if you don’t save time – and stay current.
I think I’ll go for Google Groups Alerts rather since its easy to add, remove rather than subscribing to groups that won’t let you leave them. I have an email box flooded with debian emails since two years or more and I’ve found no way to stop them.
Source : Google Blog
