I'm not sure how your phone does it, but my G1 mounts the microsd card when I plug in the phone and click the mount option.


I've seen many different "Iphone to Android" type articles over that last 6 months, I recommend that you read as many of these as you can find.

http://lifehacker.com/5581029/jumping-ship-from-iphone-to-android-a-switchers-guide
http://gizmodo.com/5398942/the-iphone+to+android-switch-10-things-you-need-to-know
http://techcrunch.com/2010/01/09/android-iphone-switch/