Well okay, that didn't take too long to finish up. :) Twitch Viewers now supports own3d as well, but instead of using the channel name on own3d, it uses the Live ID, so if your own3d URL is
http://www.own3d.tv/somechannel/live/123456 , you put "123456" in the text box to get the viewer count.
(File links are the same as in the previous post, but I'll past them again, just in case:)
The binary itself is available here:
http://www.apehead.se/twitch_viewers.zip
And the source code (Visual Studio 2008 project):
http://www.apehead.se/twitch_viewers_src.zip
Things: The "x" button in the main window clears the max viewer count, and when file output is enabled it outputs the viewer count to viewercount.txt. When using twitch, type in your channel name in the text box in the application, minus the twitch.tv/ part of your Twitch URL, when using own3d, use your Live Stream ID, the six digits at the end of your live stream URL on own3d. I suck. D: