Previously, the $99 that Windows Phone devs paid annually to get access to the Marketplace covered up to five app submissions -- but Microsoft looks like it's willing to play ball in an effort to drum up more interest in third-party development ahead of Windows Phone 7's release by chucking the five-app cap. Well, sort of -- paid apps will have unlimited submissions, but free apps will still be limited to five per yearly cycle, with additional submissions running $19.99 each. Additionally, Microsoft is taking the wraps off its Trial API for helping developers enforce trial functionality prior to purchase, details on its push notification service, and a new option th
