Yep, I could design a front end to interact with that. I could write the back end pieces, but if someone else is wanting to write that and just give me some web services to hit then that's fine.
For my work I program in VB.NET/C#. I'm comfortable working with Java and am actually building an android app for my company right now (it's in the design phase, so I'm doing a lot of front end work right now, actually). I'd have to brush up on obj C for the iPhone app, but I've created a few tests apps there as well so it wouldn't be too difficult to get back to speed in that area.