Sunglasses are a really good idea. I have three sets of lenses for mine; yellow for overcast conditions (the sun seems to come out!) and two darker pairs... not sure what's the difference.
Re. food, best go for carbs with low glycemic index. That is, coarsely ground grains that take as long as possible to digest, so you don't get a jolt of sugars all at once. In theory whole grains would be better than refined, but in practice even whole wheat flour is usually so finely ground that the benefits are pulverized.
Question: What do you buy if you have to stop at 7-11? (I get V-8 juice, fig newtons and corn chips).
Always carry money, ID, and a card or something that says "in case of emergency call [someone who's not on the ride with you]".
Some sort of a rudimentary first aid kit is a good idea. The only things I've used in mine are: paper napkins (lots of them!), those wet-wipe things in the little foil pack (just a few), and a pair of tweezers. Bandaids are probably a good idea, but I've never had need of 'em.
The nipple thing is totally new to me, in fact I strongly suspect you guys are pulling my leg. Ditto chamois cream.
No joke. Although I believe it is more common in running. "Warning" the following image may be distrubing.
Well, not really.
For those who may be unfamiliar with this phenomenon, it is called male nipple chafing, or sometimes, the "sad clown face". The repeated abrasion between the skin and a wet shirt (particularly cotton) over thousands and thousands of strides eventually causes the below to happen. It's completely preventable - band aids or a lubrication product called BodyGlide will usually do the trick.
I speak from experience. It happened to me on the bike. It's just the way I'm built, so I have to cover them up on long rides in high hummidity. Otherwise, raw meat.
Now the chamois cream is something I never used. Never needed it. Seems like a solution in search of a problem but I'm sure lots of people swear by it. Just the way I'm built.
Also, those are some good tips to add to the list.