parallel tasks

I'm pretty excited about some recent developments I've recently done in the HTTP Parallel Request Library. Thread that has all the dev info: http://drupal.org/node/1427958

You can now issue a callback in the event loop (just like node.js) so while your function callback is running, I/O is still going on in the background (http requests currently), filling up buffers waiting to be read after the callback is done executing.

I'm looking for some feedback. I'm using the workflow module and generally find it very good. Very easy to setup and can be extended to do quite a bit. The only thing it seems to be lacking that I keep finding myself needing and having to work around, is parallel paths. Does any one have any ideas on how to accomplish this? I am a fairly adept programmer and may be able to devote a little bit of time to this, but looking for some input to see if anyone else out there has this need or has any ideas on how to accomplish this?