Super simple app...

Hi I need a simple app developed (it's a utility app, NOT a game)... Simply it will get contents from an xml file (online)... this file will be formatted in the way that we want (it's my file, and will be hosted on my domain). May be I will host it on Amazon S3 (for easy/quick download around the web)... but this won't make a difference at the beginning. Anyway... the app should be cross-platform... it's important to cover: -- iOS (iphone + iPad). -- Android (phones + tablets) -- Blackberry -- Windows Mobile tablet/phones. Now... to keep the development costs reasonable, the application MUST use a cross-platform system... You can use ANY platform that you like or have used before... the following are just EXAMPLES: [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] So, in your reply... please tell me the following: 1- Will you be able to design the app for all OS mentioned above? or you'll work only with specific version(s)? Priority is given to bidders who will provide cross-platforms apps. 2- Will you make a native app? or use a framework? if the later, then tell me what framework(s) YOU have experience with? 3- If you have previous showcase apps, feel free to show them to me in the PM. Thanks for looking, Mary