Were can I see what luxuries I have?
I think I have scoured the game to see a nice list of what luxuries I have, or do not have so I can go get them. But I have yet to see a list. Strategic ones are easy to find, (top of the screen).
Hover over your happiness indicator and it will list all the luxury resources that you have - which also contributes +5 happiness to your empire.
Anyway, having more than 1 luxury resource of the same type does not increase your happiness level but is helpful when doing trades. Also some luxury resources like gold, gems are good production tiles while incense adds cultural bonuses if you have a wonder in that city.
Is there a list that gives you the number of potential luxury resources? (i.e. resources within your territory but not mined/tapped)
Nope. Lots of people have been asking that here on the forums and as far as I know, no one has found it, yet.
You can, of course, scan your territory, but it's a real PITA.