When I have Skype running (not in "Offline" mode) I often see it start eating about 0.5 kb/s of my traffic (so the network quota meter is dropping inevitably and internet stops soon). When I restart Skype or make it go offline-online, it starts forwarding it's things again soon.
How to have Skype available for chat, but not sapping my traffic (at least when "ppp4" is up)? I feel the majority of traffic spent by Skype is unrelated to my own activities (I mostly use text chat).