My take on Android is that we will see should see a similar ripple type effect that we saw with the iPhone launch.  Due to the fact that T-Mobile has such a limited amount of penetration in the enterprise market the buzz will probably be much less than the iPhone launch.  The device needs to be tested and verified, as should all devices prior to being allowed on to any company network.  It might be a good idea for IT teams to start testing the open source OS since we may see more to come in the future and they will eventually work their way into the enterprise market.