Internal Communications

Without an internal communication department, how do you get the word out?

I think that we have a pretty good system of seperating the "soft" company-wide emails like, "Hey dude, I'm selling my car," from the more important stuff like, "We're starting a new committee and need volunteers." We have an Intranet, an internal "Reportal" that anyone can access and we do monthly company-wide meetings, but people still feel like they aren't getting all the news.

What methods of communication is your organization using to spread the word? How do you ensure that everything that needs to be communicated is shared?