Most colleagues prefer to use wiki-markup language because it is so damn fast to write in, (untill you want to do something it can't) but for the die hards it might be good to use pure html too. Customers will not write our documentation unfortunately, they will just read it (unless you mean MY customers, which are my colleagues ;-). I am a bit worried about using a full CMS like the everything engine or one of the 3000 other ones. THey might be too heavy-weight for this.