Does your employer allow you to use productivity Apps on your Blackberry, iPhone or Android?

With the recent discussions about Apps and how consumers want the freedom to find, evaluate, and purchase Apps for their Smartphones, I'm curious to know how many users are able to download and use a productivity application and how many have policies that prevent them from doing so.

If you found a productivity application for your mobile device that was proven to increase your performance, would you: a) be allowed to install it? b) encounter resistance (or refusal) from IT to allow you to install it? c) make a business case to management for why this App should be allowed?

Please take a moment and vote in one of the two quick polls below, then scroll down to share your comments.

Update: The survey is now closed. View the results below

I'm not asking whether you think Smartphones connected to enterprise systems should be locked down or not - there are many valid arguments for both sides of that discussion. What I most want to know is what the current climate is like when it comes to productivity applications on mobile devices and what organizations are doing to encourage/permit or discourage/restrict users from downloading and using productivity applications on their mobile devices.

Update: I split the question into two separate polls because otherwise the results could be skewed in favor of the iPhone/Android as these devices are often unmanaged/uncontrolled in the enterprise.