Why is everybody crying before the iPad has even reached the market. The iPhone OS 3.2 ( the One specialy made for the ipad) has some new features (Register as a developer and then read the docs).
One very big news is filesharing. according to the development docs the new os gives applications the ability to share files between apps and the desktop. Ok this works only over usb, but who wants to sync several gigabytes (videos, applications,etc) wireless?
There is an api for supporting a secondary screen. ( By the way there is an dock to component video adapter and one for composite/s-video availabe for the iPhone so why shouldn't this be possible for the iPad for presentations)
Looking at the camera adapter shown on the apple website, i think the usage of usb devices will be possible in some ways.
i think keynote will handle powerpoint presentations. As far as i remember keynote on the mac can read powerpoint. The export to powerpoint is not as good as it should be, but this is not the problem for using the ipad in presentations.
One major market for the iPad seems to be ebooks. When i compare the kindle dx (9.7" display, $489) to the iPad i'll get a lot more out of the iPad.
Comparing to my S10, i would prefer the iPad for reading

I won't use the iPad as an musicplayer. It's to big, but as a video device it looks really nice.
Everybody was expecting a tablet-mac, why?
Imagine drawing on the iPad, or planing your new loft/house/... by symply pushing everything around at the tip of your fingers.
A windows based tablet uses windows programms. Windows Programms are much more expensive than apps for the iPhone.
Windows Programms use a Gui written for mouse and keyboard usage. All this makes the iPad a really cool device for the (newly written)
applications on multitouch devices.
So stop complaining after only seeing a (first) presentation of the device.
Just wait for the iPad and its Applications. Then we can discuss what is possible and what is not.
Just my thoughts guys
cu
Harald
UNIX is user-friendly! It's just very choosy about who its friends are, and even best friends fight sometimes.