Bitcomet.com is a good torrent client program to use.
Other website i can recommend for PV/MV is
http://bittorrent.frozen-layer.net/?fansub_id=112As for tokyotosho.com, all i can say is that you need to be patient and look through ALL of the backdated stuff.
My list of PV/MV downloaded mostly from these two sources:
GS/GSD = Invoke, Ignited, Moment, Reason, Find The Way, Pride, Life Goes On
FMA = Melissa, Kesenai Tsumi, Rewrite, Ready Steady Go
Yami to blablabla = Op theme
Scramble = Op & Ed theme
Elfen Lied = Be Your Girl
Naruto = Haruka Kanata, 3rd Op theme
GTO = Driver's High & 2nd Op theme
Detective Q = MeiQ!? Meikyuu MAKE YOU
Kannazuki No Miko = RE-Sublimity & Suppuration -Core-
BECK = Op theme
Others = Innocent Starter, Northern Light, Grip, Get Along, Ningyo Hime, Little Wing, Fall In You, Metamorphose, Houki Kumo, Butterfly Kiss, Love Slave etc etc.
Some other clips from concert, live, guest performance from misc artists.
So, all i can say is be patient and spend quite some time shifting through tokyotosho.com to get most of the MV/PV offered there.
p/s: I'm currently looking for Gundam SEED Op 3 "Believe" & Op 4 "Reason" PV from Tamaki Nami. If anyone know where to get it pls tell me. Thx.