I see the same on this machine, however I dont think the problem is
Skype. I got the same problem recording with gnome-sound-recorder, 2 to
3 of my 4 cores max out after a few seconds with gnome-sound-recorder
while recording and pulseaudio process each taking 120-160% cpu. in
fact, just running pavucontrol uses 130% cpu.

Interesting perhaps: the "duration" in gnome sound recorder is totally
off the scale while recording, minutes increase every second, the hour
count seems to go up every minute.  I do not have this problem on my
other Karmic machines were pulse audio works normally. Perhaps a clue?

This is the soundcard of my problem machine:
80:01.0 Audio device: VIA Technologies, Inc. VT1708/A [Azalia HDAC] (VIA High 
Definition Audio Controller) (rev 10)

BTW, if I plug in a USB headset in the same machine it works flawlessly.
Im running Karmic, installed all updates, including backports and proposed. 
Kernel 2.6.31-15-generic

-- 
Skype+Pulseaudio ->extensive use of the CPU power
https://bugs.launchpad.net/bugs/478658
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