I'm just wishing here, so..
- If the iPhone is going to work with the

tv, then it will have to communicate either by WiFi or IR. That means Apple should certainly provide an IR attachment if so needed. If the battery wasn't so much of an issue, I'd also suggest giving the iPhone IR just so it could serve as a really cool, albeit very expensive universal remote. Maybe a future touchscreen iPod will get IR instead of WiFi and serve this purpose.
- Everyone seems to want GPS for the iPhone to take advantage of all the cool map and local search features it would afford the user. If Apple is going to control software for the iPhone with such a tight grip, then they will be the only party capable of adding GPS to the Google Maps and therefore they'd be responsible for the GPS attachement. Even if the GPS was he same size as the iPhone itself, the combination would still be more compact than any self-contained GPS unit with the same size screen. Plus, if the GPS add-on contained an additional battery pack to extend usage time...
- I'm fairly certain Apple will contain some way for the iPhone to present Keynote presentations. This means some way to go from the 30-pin dock connector to a VGA/DVI output. If they're smart, they'll also add a way to charge the iPhone at the same time. If this is something they'll run straight out of the iPhone dock, I'm alright with that. Its still less stuff to take to a conference or a classroom. Aside from the connector itself, I'd also like Apple to provide some sort of remote control. If the iPhone is tied to the projector I can't very well walk around and use it as the controller. So either Apple gives me a bluetooth/WiFi remote OR they make the video out wireless! This would toss the charging option out the window, but it would make running the presentations much easier! Just imagine a little box you plug into the DVI socket on the projector and into a power outlet nearby (I can't imagine such a WiFi enabled box could run without dedicated power).
So in summary, I'd like Apple to make available some way to control my

tv, a GPS attachment that doesn't kill the battery, and a way to run my Keynote presentations off the iPhone while having the freedom to walk around.