You're right - Marvin is just for iPad - for now. Version 1.2 is in final stages and should he released VERY soon. As soon as it is the developer, Kris, is making it iPhone compatible. Kris is very fast and should have that done by the end of February-ish.
If you have an iPad to try it out on, I would highly recommend it... Then you won't need to look any further for a stanza replacement, you will just be chomping at the bit like me waiting for the iPhone version!
