The new 4.0 OS for iPhone due to be launched today likely won’t have Flash, but Greystripe has an app for that.

The company, which runs a mobile advertising network, this week launched its iFlash ad units for the iPad. Greystripe’s iFlash ad units allow advertisers to deliver their existing Flash creatives on the iPhone and iPad. The company says a recent survey of its advertisers show more than 50 percent are interested in using its iFlash ad units on the iPad.

Why the interest? Many ad agencies and brands have created ads in Flash for use online, and they want to use the same ones for the iPad. Because it offers the bigger screen size, it’s more likely they can do that without changing the size of the ads.

Greystripe CEO Michael Chang says his company has talked with a lot of developers and advertisers and even though ad standards are not fully set in terms of the iPad, it appears they’re going the way of online standards. “They plug our SDK into their app, and as an ad network, we sell that ad space” to brand advertisers.

Expectations are high that Apple will release iAd today, but it probably won’t be Flash related, so Greystripe has the advantage of offering up its solution for digital media buyers that are using Adobe Flash for at least the foreseeable future.

Chang sees big changes ahead in terms of what the iPad can do for the media and advertising industries. It’s one device that unifies a user’s media consumption, and Apple has the potential to gather a lot of information about what the user is doing.

Yesterday, Millennial Media announced it is releasing an SDK and the PadMedia Creative Suite, with new creative ad formats, built specifically for the iPad. The PadMedia creatives will be formatted and available on other tablet devices later in 2010.