The use of an Intranet
This may be commonplace, but I am pleased of the side-effects our corporate intranet has on e-mail traffic. The intranet basically features some business-specific stuff plus the following:
Forum* News* Agenda
The effect of these three little apps: No e-mail flooding of the inbox. Only relevant stuff is sent around, all the rest is located on the entry-page of the intranet. Sweet. Only an RSS feed’s missing :)