This week I gave a presentation at the PHP Vancouver conference. I showed off how to write a pluggable I_S (wrote it the span of about two hours). You can get the code from here:
The presentation can be found here:
Finally there is inside of the 5.1 tree an example of a daemon plugin in the plugin/ directory. It just shows how to generate a thread and creates a simple heartbeat file. If I get a chance I'll add an example of how to have it also generate a network heartbeat as well (should be einfach).
BTW I've released the latest version of the memcache engine for MySQL. You can find it here: