Found both on the web, so if anyone else needs:
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From: Kevin Kane (frnkzk@Glue.umd.edu)
Subject: Re: Negatives
View this article only
Newsgroups: alt.sport.weightlifting, misc.fitness.weights
Date: 1996/12/07
David Grant wrote:
> What are negatives? I have seen this term mentioned in many FAQ articles
> on the internet. I've been weightlifting for one year now, and I am
> wondering what negatives are.
That is the part of the motion that is in the direction of gravity. For
example, it is the lowering of the weight in bicep curls or squats and
so on. It's mentioned because of "controlling the negative", which is
maintaining a certain muscle tension during the lowering of the weight,
as opposed to letting it just drop, which both gives the muscle a bit
more work, and invariably extends the life of the weight.

--
Kevin Kane <frnkzk@Glue.umd.edu>
(found from here)
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Drop Sets
This entails doing a set to failure with a weight then immediately doing another set to failure with a lighter weight.
(found from here)