i use 'RTOM' Moongels atm and they do reduce overtones quite well, my snare had nothing but overtones and unwanted vibration, i stuck 2 moongels on there, and now its alot better sounding same goes for the toms, they work nicely
i have only 1 moongel on my snare and it works wonders...dont like them on the toms because they either do nothing or kill the sound so i just stay away from them.
for a cheaper alternative to real moongels you can use the sticky hands from quarter prize machines and they do the same thing for a fraction of the cost. for a full review of this go to drums.com/drumtalk and check out the sticky thread under general drums discussion.
I use weatherstripping for doors. It works just as good and it cost me about a dollar twenty-five cents. there's about 6 feet ( what is metric = 2 meters?) of it. You can use it for other projects.
I just use it on my snare, too. 8)