If it's for creating youtube video recordings, I recommend you get a fairly cheap recorder, like Zoom or Edirol (I've used the R-09HR; it's not prohibitively expensive), then record using both the video recorder and the audio recorder. The internal mic on the Edirol is ok, though you will get higher quality results if you buy an external mic. Camcorder audio is artificially limited in range by the camcorder itself, hence the advice to record audio with a dedicated recorder.
Subsequently, using Windows Movie Maker or similar software (for example Sony Vegas, which is better, but not free), import the video recorder (which will be a video stream and an audio stream) and audio recorder tracks, align the audio streams in both so that they match up, then mute the audio from the video recorder, and export to WMV or other video format. It's easy enough once you get the hang of it.