Since the release of Skype for Windows 5.0 most DV cameras connected via firewire and used with Windows Vista or newer work without the need for any additional software.
If this is not the case these tools might help you in getting DV-cams work with Skype Video:
TrackerCam [ Link ] - If used together with Skype it should enable your DV cam within Skype. (Could not test myself)
Splitcam - Free and light solution that should work with most firewire cameras.