Being a fan of both sabnzbd+ and Google's Android device, I took it upon myself to create a client for sabnzbd that runs on Android.
NZBdroid is now available on the Android Marketplace. While lacking many features, the really important stuff is there.
On nzb search engines that return direct links to nzb files, one can simply click on them in Android's browser and my app will fire the url off to your sabnzbd installation. In in-development version also downloads nzbs to the device and uploads them to sabnzbd via POST. (This latter bit is proving to be a challenge, as T-Mobile seems to be doing something that mangles the nzb files in transit from binsearch.info and some other sites that require the use of a 'submit' button. Hopefully I can get the problems worked out.)
Here's a little video of it in action (the Android emulator run's veeeerrry slowly on my computer, though, so it's very sluggish-looking):http://www.youtube.com/watch?v=F2xC8hkeIyE
Future plans are to display/edit the queue right in the app rather than pointing the web browser to sabnzbd, as well as seeing the current status. (Neither the queue nor history work for me on Windows via the API, either before or after the 1.4.9 apikey update. Hopefully this gets fixed soon so I can use it.)
One nice thing is that I have it scraping the apikey so that the user doesn't have to type it in. It REALLY sucked typing it in manually before I had the brainstorm to just scrape it.
Anyway, I figured there might be some Android users here who haven't noticed it in amongst all the flashlights and tip calculators in the Marketplace.