The purpose-built Motors app will make searching by year and model far easier with a custom home screen search, along with features like VIN scanning and a virtual garage. And of course you can also search for vehicles and parts through the traditional year/model format, plus you'll have access to details, specs, a photo gallery and the all-important vehicle history report.
The most trick option appears to be the garage app. The function will enable users to scan vehicles you own by bar code (via the iPhone camera) for easy retrieval, which is plenty easier than manually entering a 17-character VIN. You can also store part searches like "crankshaft for 1991 Taurus SHO" or set up a to do list for that project car you've been neglecting. The app is set to arrive in early 2011.