Hey Wes, I've just purchased MobiLinc a few days ago and so far having a lot of fun setting up my ISY-99. I started out with the SmartLinc 2412N but as soon as I found out about the ISY, I purchased one and put my 2412N up on eBay.
I'm also an iPhone/iPad developer and would just like to echo my support for an iPad app. I hope you go the route of a Universal App and include it for people who have already purchased MobiLinc for the iPhone. The possibilities of using the extra screen real-estate are really cool.
As far as other suggestions for the app, I'd love to see the ability to control devices without using the popup window. For many devices you just need an On/Off state. I envision a custom TableCell that has the device name on the left and a switch control on the right. The switch would not only function as the current device status, but could send the command when the switch is toggled. This would make it easy to manage lots of devices with a lot less tapping of the screen. Perhaps when adding a device to favorites, you could specify on/off or dimming as the default control, and if they choose dimming, show a slider instead of a switch. Then operating the slider could set the dim level.
Thanks again for your work on the app. I look forward to seeing more updates from you!