I've had my Ipad wifi 3g now for over a day. It's working great. So i started to clean up the packing materials. I noticed attached to the White cardboard folder that says 'Designed by apple in California" a tiny metal clip. The end of this little clips is used to push in the hole that releases the microsim card. Don't worry if you already tossed this. You can still use a small paper clip to do the same thing.
Ipad WIFI + 3G Dell XPS, HP Dragon and HP Tablet PC, Windows 7