I advertise on here ( www.expat-auctions.com), so I hope people don't see this as an advertorial ( sorry if you do)
I started it as a lower cost alternative to the larger sites, and also to allow users to advertise in English wherever in Europe they are. One of the main reasons was to help avoid the usual questions when advertising on other expat site - where are you, can you send me some pictures, whats your best price etc.
I also use the ipad a lot - every day in fact, so I have a vested interest in trying to make one of these apps. At the mo it looks like the android bit is fairly straightforward, but costs a bit to submit the app to Apple for approval ( this appears to be the norm unless you are certified developer and have the SDK kit as I think it's called), but the costs are not prohibitive given the potential end user benefits..
Rather hilariously, I don't have an android phone, so once I have finished the app, would anyone here be prepared to test it for me ? :-)