Celiac.com has a safe foods list towards the bottom of their menu options. I haven't looked at in a while, but it explains the reality differences between the celiac association recommendations and living in the US. For example, mono & diglycerides are made from corn in the US, but in other countries they could be made of wheat.
American oats are not recommended - they are highly cross contaminated with wheat. Bob's Red Mill has just started distributing a gluten-free oats product that is available online. Old Wessex Irish Oats are tolerated by some of us and found in most mainline grocery stores or health food stores.
I find Tinkyada brand brown rice pastas to be the best - the texture holds up. I buy most of my online products from kinnikinnick out of canada. Pizza crust, oreo-type cookies, breads, etc. My gf baking attempts are not always the best.
The 2006 labeling law requires US manufactured products to list 8 major allergens, one of which is wheat. this is very helpful, but be wary of products manufactured on the same lines as wheat products. Unless they clean their equipment well, the cross contamination factor is still there. Barley malt should also be avoided - the labeling law does not require barley. That means no beer of course! Although gf beers are available if you can find them. Anhauser Busch is making RedBridge - a gf beer. I can't find it in my area yet, though.
Delphi forums has a Celiac Online Support Group that has a list of foods and companies that have been checked out as "safe". I found it very helpful when I started out. It is a great forum.
If you stick with basic, whole foods at first, you will learn what you can add as you go. It is getting easier and easier to find gluten-free foods in grocery stores - usually in the health food section - but sometimes it's just more starch and not necessarily good for Crohn's. Some of the products are good, and some are awful. But it depends on your taste.
GF breads must be toasted and/or warmed to be edible.
I know how overwhelming the gluten-free adventure is at first. And don't let the doctors tell you it can't be done. It can - it just takes time and patience.
Hope this is helpful!
Dx with Crohn's Aug 2007; celiac sprue July 2002; Type II diabetes Nov 2006. Current meds: Entocort, Asacol, Levoxyl, Fosomax, various vitamin supplements.