It's odd to me that none of the other phone makers have cloned that part of the iPod/iPhone ecosystem. When the iPhone 3G didn't come with a dock in the box (like the initial iPhone did), I bought the Apple universal dock instead. Whenever I get a new phone, I just buy a cheap little plastic insert for the universal dock. Some iPhone case manufacturers even make dock inserts that match the phone case.

Docks in general seem to be going away. I remember years ago, almost every PDA came with one (including my old Palm III, Palm V and iPaq), and there were docks for almost every mobile phone. Much more rare to see them these days.