Actually there is a Cydia app, named AirVideoEnabler to breaks the AirPlay limitations, but that's app for jailbroken device only, when we all know that not all users decided to jailbreak their iOS devices, thus they are seeking for solution to these restraints and expecting Apple to release full-fledged support for the feature on third-party apps through a public API developers could use for their apps.
But here is a good news, a reader of MacRumors sent an email to Steve Jobs and he received a response from the CEO saying that Apple hopes to present what it's supposed to be with AirPlay in the next year, here is the screen shot of their email-exchange:
Q: Hi, I recently updated both my iPhone 4 and iPad to 4.2. I think my favourite feature is airplay. This is seriously amazing and makes sharing content seamless. I just purchased Apple TV and was wondering are you ever going to make airplay video work for videos in safari and 3rd party apps? I hope to get a response. :)
A: Yep, hope to add these features to Airplay in 2011.
So we just wait for the next year to get AirPlay (with Safari Video Streaming & Third-Party Apps) we wanted!