Note: this post is from 2008, outbound links may be broken.
Jonathan Schmid-Burgk releases House Effect VST
With this VST plugin it is very easy to create a house-typical extreme compression. Simply chain it as an insert-effect after your synthesizer and connect its MIDI input to the baseline via an aux-send of the percussion track. The basedrum will now trigger a strong gain.
House Effect is an open source project and you can get involved here.