Internal phone storage. If you use the app "File Manager" you can easily access it. I've heard a number of other file managers work well for this, too.

 

I have heard that when Froyo is released it will allow apps to be transferred from the phone to the SD card.

 

Probably the easiest way to answer that would be to mount the file system on your computer, and check the contents of all those folders (even just right-click, properties, and look at the folder size.)

For me, I'm using about 5 GB. 0.5 in Music, 4.1 in Videos, and a little here and there in other stuff. My DCIM (camera photos) takes up roughly 0.2 GB, but I keep it trim.

 

Good question. My Android directory uses less than 50 MB.

As far as I understand, the internal phone memory should be around 2 GB. Someone correct me if I'm wrong. I don't know for sure if that's just space available for apps, or total space. I believe it is basically all the root file system stuff.

 

Are u guys saving contact information on the phone or sc card?