I've made my own tool to download streams from cam4. I was using Replay Media Catcher, but with many videos the audio is out of sync.
Give me a couple of days. I still need to change a few things.
You must have WinPcap and at least .NET Framework 2.0 installed. It automatically sniffs out the rtmp url, extracts the title from your browser and downloads with librtmp.
Here's a screenshot:
