As a hobbyist developer, I play with android SDK.
There was a recent update that supposedely adds the ability to sync up to both PS3 and XBox Controllers.
It is breifly mentioned here:
Google announces Android 3.1, available on Verizon Xoom today -- Engadget
And the functionality is laid out in the SDK Code library, but a little technical to post here.
Keep in mind this is an
SDK update, therefore, the developers have to tap into it.
I have the SDK, but I haven't played with this feature yet as I'm working on other apps.
I don't work for Google and I'm no insider, but the foundation is laid.. Now we just have to see what comes of it!
But as already mentioned the
WiiMote app works great for emulators..