We have already mentioned that SplashID and SplashShopper are on their way to the iPhone shortly, but let's not forget about the SplashWallet application that is arguably most powerful - SplashMoney. With online banking downloads from many US banks, SplashMoney is a formidable competitor for Quicken on the desktop itself (available for both Windows and Mac OS). But as a mobile personal finance manager, it is second to none.
I should also mention that it is already available on Palm OS, Windows Mobile, and now BlackBerry as well.
The iPhone/iPod Touch version will have one new feature the others don't have yet - live updating currency. It's handy for recording transactions while you are traveling abroad in a different currency, converting them on the fly to your bank account's home currency.