I'll still some way off getting mine up and running...
The TT MCE_Tools, just doesn't work in Vista after hours of trying (TT autodecoder in particular). Some people have had success on xp dual boot systems, but as VistaTV is replacing it, Im just going to have to wait until my copy arrives within two weeks.
Until then I have been configuring DVBviewer, which IMO is the best of the 3rd party DVB apps. A pleasent find was a 'post processor' plugin, that enables ffdshow for upscaling and post processing which is good.
Im now looking into getting Theatretek up and running in 'my movies' for vista, to take advantage of the codecs and processing etc (while waiting for my VistaTV) so hopefully everything will eventually be under the gf friendly green button for access.
The only thing will be HD-DVD/Bluray functionality, that is only really fully supported in PowerDVD at the mo, so won't come under the vistamce umbrella.
Heres quite a good site for the setting up of codecs etc, and I hope to write my own guide soon for setting up in for VistaMCE.