Craig Smith has updated iPad Frotz 1.5.1 incorporating several new fixes in the support of Glulx games. While Glulx support is still beta, it works much better now, enabling the use of Aaron Reed's keyword interface in its full glory. (The prior version would occasionally cause normal text to occasionally be displayed in keyword colors.)
Great work Craig! Much appreciated. Best of all, Frotz is free on the iPad, iPhone and many other platforms. You can download it from iTunes.
Now if only someone would create a Glulx or even a Z-code interpreter for the Kindle. That would be cool! Heck if someone wants to do a kickstarter there, I would gladly kick in money. (again)