Rhythmic Placing

Listening to the snare drum in the quieter bits in this recording (e.g. around 20 sec. in):

This is not sloppy playing, but a deliberate, and fascinating, offset. We all too often forget these kind of nuances - things that happen in-between the beats and that are difficult to capture and analyse.

Percussion instruments

Here are some examples of (mostly) unpitched percussion instruments. And here is a list of some of the more common used unpitched percussions.

Simple Metric Modulation

A drum tutorial explaining metric modulation (with notated illustrations as a bonus):

Risset's Rhythm illusion

An analogy of the endless glissando is an ever increasing (or decreasing) tempo. The method is explained here. Dan Stowell  created a version with supercollider.

From a drummer's perspective

Here is drummer Gavin Harrison talking about working with less common time signatures (7/4 in this case):

Percussion instruments

A guide to many percussion instruments from The Orchestra: a user's manual project. 

Interaction

Analogue 'sequencer' using distance sensor (with the arduino platform).
Silent Drum from Jaime Oliver (not jamie) using Pd/Gem to map gesture to audio creating a new instrument.

Drum notation

A guide to drum notation from MIT.