Interflicks (formerly Interflix) is software written by Phil Wade (me) for android phones that allows management of a user's Netflix queues. And no, you cannot watch instant titles on your phone. Netflix hasn't exposed that functionality in their API yet (sigh).
It is currently open Beta software - that is, most of the features are in place, but bug squashing and application polishing are still in progress. The current version is v0.4 and is available in the android market.
You can get a closer look at it on appbrain: http://www.appbrain.com/app/interflix-beta/org.philwade.android.interflix
Please create a ticket (Click here) if you are having an issue or if there is any feature you would like to see. I love feedback!
Also, if you would like to get in touch with me, you can also email phil [at] philwade [dot] org.