[linux-audio-user] Voiceover project

Hi, I need to do some voiceover work, and I was wondering if there was an application or a set of apps to do this with Linux. The video I was given is an MPEG file, and I need to redo the voiceovers of the presentation. The only voiceover work I have done was in Windoze with Sonar 3, which I don't have access to anymore. I can think of a few ways of doing this (coming up with an EDL, recording the voice, and editing with Audacity or something). What I really want is an application that will let me easily replace the audio track of a video with another (preferably with a GUI). I know that I can use tools like mplayer to dump out just the video and mencoder to re-encode, but if there is an easier tool (more automated), I'd like to check it out. Thanks. Jon