Here's a (hopefully complete) list of the tameable monsters in the game:
http://yokohama.cool.ne.jp/shisnap/game ... ork2_m.htm
(again, it's in Japanese and you have to set your browser's character encoding to Japanese)
The columns go in this order (from left to right): Name, Location, Ideal method of capture, Ability (once captured), Element, Force Cost
Assuming this list is complete (and I believe it is), the haunted silverware cannot be tamed. :(
There are also 49 monsters in all.
Also, the walkthrough supports 2 things Phlebas said:
1) HP does matter (the weaker the better)
2) You can capture creatures using any kind of method (I can also verify this as I have been using nothing but tame and never used scold or comfort yet >>')
I'll probably translate the whole walkthrough later this week in case anyone wants it.