I just wrote a step sequencer for my new PadKontrol and thought I'd post a shameless plug on here
I tried the ableton template sequencers I could find and the max patch, but I couldn't get them to work the way I wanted to.
So yeah.. I wrote my own.
The way I'm using it is with Traktor&Ableton. Traktor handling the beat clock and live as a drum machine/sampler (the sequencer controls ableton)
This is still very much in development, so there are probably bugs.
It's also my first project to do with MIDI & MIDI Synchronization
Source and binary available from: http://github.com/aptiva/sekwenser
To build the source you need BWToolkit from http://brandonwalkin.com/bwtoolkit/
Please post any questions/feedback!