I'm having a similar problem with 2.0.0~bzr466-0ubuntu1 which is now in the karmic repository.
I dealt with this a few times by just killing the gwibber-daemon process.
Then just now, this was happening with just a gwibber-daemon, and no gwibber process, running. I then launched gwibber from the indicator applet, and when I switched from 'Home' to 'Messages', gwibber-daemon stopped using the CPU.
I'm having a similar problem with 2.0.0~bzr466- 0ubuntu1 which is now in the karmic repository.
I dealt with this a few times by just killing the gwibber-daemon process.
Then just now, this was happening with just a gwibber-daemon, and no gwibber process, running. I then launched gwibber from the indicator applet, and when I switched from 'Home' to 'Messages', gwibber-daemon stopped using the CPU.