RPM

Multiple YUM repositories, one for each VDT version/OS combo. (Different architectures can be in the same repo.)

Example layout:

rpms/
  |
  +--VDT-2.0.0/
         +
         |-----Centos5/
         |-----RHEL3/
         |-----RHEL4/
         |-----RHEL5/
         |-----SUSE9/