Everything in omnifocus can have a comment: projects, actions, whatever. I've used the comment field on projects for a while for writing down the outcome ("the bike is fixed"). I've since just changed my style of project naming: big long-running projects still have a generic name ("customer A"), but most of the projects have an outcome-title ("bike is fixed").
I've now started to use the comment field for reminding myself about project support material. If I've got a physical folder "bike maintenance" that I use to put ideas and whatever into regarding bike fixing, I'll put a note to that effect in the project's comment field.
After a while I tend to forget I wrote down previous ideas and stored them in that physical folder. This fixes that problem once and for all :-)
My name is Reinout van Rees and I work a lot with Python (programming language) and Django (website framework). I live in The Netherlands and I'm happily married to Annie van Rees-Kooiman.
Most of my website content is in my weblog. You can keep up to date by subscribing to the automatic feeds (for instance with Google reader):