For you developer types out there, Microsoft has updated their Windows Phone 7 Application Certification Requirements. The long and the short of it is that Microsoft has a set of rules that all of the apps in the Marketplace must follow; this would be that set of rules. Most of the changes are of the "Revised" and "Updated" varieties, but it’s at least good to know that Microsoft is serious about making sure these apps are fit for public consumption.

The Windows Team Blog has the rundown on all of the changes. For the full document go here (PDF link).

Update: CNet's Ina Fried gives us some more details via the Beyond Binary blog. It looks like at least a portion of these updates are focused toward applications that need to run while the screen is off. This quote from the CNet post gives you the jist...

Until now, applications that wanted to run when the screen was locked had to get the user's explicit permission. Under new rules announced on Friday, programs can do so without permission--provided they first demonstrate to Microsoft that they only use a reasonable amount of battery life (allowing more than six hours of use for an app playing audio and more than 120 hours for a program that does not play audio).