It's cheaper to replace an SD card. If you fill one up, just pop in another one, or get a bigger one. I can unplug it, pop it in a buddies phone to install an app that I have on there, or if I dont have a cable, i can stick it into a laptop and copy files over. All without the need for a special Iphone cable or Itunes. I just need a simple and standard microSD cable or something that will accept an SD card.
It's the whole thing where you have to rely on specific software thats installed on a specific computer. I will receive an OS update OTA, where ever I am, and all I have to do is click OK. If there is an error (which is less likely because the phone isnt dependent on an outside computer that might lock up or lose communication while in the middle of the update and cause harm) the update can be done completely independently by simply booting the phone into recovery mode (which unlike the iphone recovery, is independent and doesn't require itunes), reinstall the update.zip, or do a complete wipe and reinstall. When it comes back up, everything is sync'd OTA and you are back to normal....see above post.
Android has a notification bar at the top, where all your notifications are displayed to you. It is a drop-down/pull down bar. So say you are on a call, and you receive an email. The Email icon pops up, you can pull the bar down and click on it to view it, or click clear. You can view them from anywhere at anytime. This video shows you what it looks like.
http://www.youtube.com/watch?v=T89Eq-kdo9o
The the Back and Menu button, you have physical buttons at the bottom of the phone. The menu button will bring up additional settings, options and features to an app. For example on the iphone, all app settings are under the settings "app", where on android you have a general applications settings under the OS settings, but also when in an app, you can click the menu button that will bring up additional options. It's similar to a computer, how they have "File, Edit, View...etc". The back button will always take you one step back to where you were before you clicked on something. Iphones do have that in a way, but its not a physical button, and it's the difference between hitting the back button on the browser, and clicking the "previous" URL on a webpage. I also don't think it's always there on an iphone.