Is there an Air Video app, but for photos?
Solution 1:
I developed ImageBank for iOS to do exactly this - streams photos from your PC/Mac to your iPhone, iPad or iPod Touch. It's universal so it works natively on the iPad, and it even works over 3G.
There's a free version too if you want to try it out: ImageBank Lite
It's only US $0.99 to buy or upgrade from the free version.
Solution 2:
StreamToMe is far better than Air Video in many ways. One prime example is it's ability to remotely view photos. It will work with files stored anywhere or even browse your iPhoto library It also supports audio only files and portrait orientation playback while Air Video does not. It's a universal app that runs on iPhones too and the server app runs on Mac or PC. Price - $2.99.
The interface is nicer and there's even a recent history for convenience. It has always perplexed me why AirVideo is more popular.
Alternatively, there's another great app you may wanna look at when you get some time called HereFileFile. It does not have an iPad optimized version yet, but they are in fact working on one as we speak. It looks very promising. However, the iPhone version is very nice. It's fairly similar in concept to these other two apps, but there are differences which I won't go into here.
Solution 3:
while it requires a jailbreak, I was really impressed after installing AirServer yesterday - I can run the server on my iPad and use my iPhoto to stream photos over AirPlay - really really awesome when you're not nearby a TV and if you are, you've got the reverse - a mini AppleTV in your pocket with your iPad as a beautiful remote for content!