Is there a list of all Masternode addresses somewhere available?
yes the information is available in every ION wallet under the Masternodes menu item. Looking at my wallet, I currently see 131 masternodes online...
Is there a list available for people that don't have a wallet? I'd like to check a few out and see how they function and behave for a few days. Would like to get a better understanding of how the coin works.
The list of Masternodes are maintained by the ION Network and only available thru the ION QT wallets or remote calls to a wallet thru the wallet's API.