iPhone and iPad apps tagged "desktop widget."
Currency Converter: Find Your Money's Worth in 200 currencies
Currency Converter, from dev Paolo Grifantini, is one of several similar apps in the App Store designed to convert dollars into dinars, drachmae, dirhams or some other denomination. It's the kind of thing you need in your pocket when you're trying to figure out whether you're better off buying that bottle of perfume in the duty-free shop or on the local economy.
iStat is Like an X-Ray Machine for Your Mac's Inner Workings
Need to know what your Mac (Macs) is up to while you're away from your desk? Bjango's iStat — System Monitoring will keep you posted and it will do that very well.
This powerful little utility enables iPhoners to remotely monitor their Macs as well as their iPhone's inner workings.