Articles or thought on benefit/gain of lightened valvetrain componets?

[PowerDubs]

Hey guys...

I have been involved in a few discussions on a different board about lightened valvetrain componets, and was wondering if any of you had anything to say about the concept, or knew any article, etc about it.

Just for kicks, here are some of the threads we have been talking in-

Lighter lifters-

http://forums.vwvortex.com/zerothread?id=1094732

Solid lifters-

http://forums.vwvortex.com/zerothread?id=1092012

Ti retainers -

http://forums.vwvortex.com/zerothread?id=1047313