I'd like to see Mastercoin listed on Kraken https://talk.mastercoin.org/index.php?p=/discussion/32/what-exchanges-should-we-ask-for-mastercoin-to-be-listed-share-your-ideas/p1

It's 4th or 5th currency by market cap, depending on the day, so I think it's worth considering. You have smaller coins cap on Kraken already like NMC. http://coinmarketcap.com/