As noted in my last post, I found the Ace Hardware How-To site to be a real help in getting a list of dimensions I needed for the closet organizer I'm building. I took a further look at the projects they have posted on the site, and I am pretty impressed.
The thing I like about this site is that they don't focus on selling you their kits, but give you the technical details for various projects. For being free information, I would rate this site an "A". I have added it to my sidebar links.
Note: I am not affiliated with Ace Hardware, I just like what I see here.