One of the primary rationalizations for getting an iPhone is to replace three existing devices. The phone and iPod functions are easy, but the Palm PDA is more difficult.
Contacts and calendars are fine, but notes/memos are a challenge. The iPhone app doesn’t sync data with the Mac. Ugh.
One solution that I’m considering is to add a private wiki, blog, or forum to the website. The iPhone’s constant internet access makes this reasonable.