Effects - Most effective ethnobotanical extracts?

[baron samedi]

SWIM thought he'd start a thread with the intention of finding out peoples experiences with the many ethnobotanical extracts available.
He's always suspected that these are bound to be the most effective methods of experimenting with all the various plants, not to mention the least time consuming, particularly if professionally made, but they tend to be pricey compared with the herb/plant in question.
He knows that kratom extract is effective, and has done it many times. He's acquired others (blue lotus, sinicuichi, tarrogon, intoxicating mint, hops, ephedra), but has often found there to be a dearth of information on how to actually consume them, leaving them to (presumably) lose potency at the back of his cupboard.
Given that there are so many available, pretty much every psychoactive plant about, there must be people buying and using them.
What are other SWIMMERS favorite extracts and what were the effects. Also, whats the best way to consume them?
SWIM would like to extend this thread to those plants which have their own sub-forums, such as kava and the like.