Please decide whether you would like to refer to yourself in first or third person.  I referred to you in third person here, because I think it sounds more formal, but you are welcome to change back to first person (but introduce yourself before writing “I”).  And please read my comments in brackets, and take them out before you post this.

History
PIW [PIW what? You need something written here.  PIW code?  PIW backend?] is based on a project Chad, PIW’s head programmer, started in 2003 called Eden.  The idea originate shortly after he discovered the Plants for a Future plant database, and noticed that the dataset was being distributed under a free license.  He downloaded the archive and wrote a perl script allowing for stand-alone use on his machine. [please explain what this last sentence means to non-techies in the audience]  This worked better than the existing PFAF search engine, mostly because he could feed it sql when he wanted to look for something specific. [please explain what this last sentence means to non-techies in the audience]  He wanted to improve it, and wrote another more sophisticated version in python as well as making a lot of structural changes to the database itself.  Chad called this the Permaculture Plant Database (PCPDB) and it was hosted on the Sandhill Farm website for over six months.  PCPDB featured a fairly sophisticated search engine with a well developed controlled vocabulary that produced meaningful results for complex search strings, such as "a fast growing shade tolerant vine hardy to zone 5", which yielded results like Virginia Creeper, a vine that actually grows locally in that microclimate.  Eden [how does Eden relate PCPDB and PIW??  You never make this connection] is based on the PCPDB code and modified PFAF dataset.

Eden and the accompanying dataset will be extended dramatically to fulfill the goals of PIW. [Please be more specific about how you are incorporating Eden/PCPDB in PIW.]