Thank ye to JNSoftware, this week's kottke.org RSS sponsor. They make software for the Mac and iPhone. Their main app is Dialectic, a scriptable phone tool that helps you wrangle your various phones, accounts, and address books into one place. It works with landlines, mobiles, Skype, Google Voice, Vonage, and many others and integrates with all sorts of apps like Entourage and Address Book.
Try Dialectic out for free for two weeks or head on over to their store to purchase. From now until May 30, 2009, get a 20% discount on any of JNSoftware's apps using the coupon code KOTTKE20 at the checkout.