The iPhone was my first apple device also. Now I've got an iPod touch and planning on getting an iPad when the next gen is released. Might even get my self a mac book if I have any money left over. Lol...
The iPhone does seem to be the gateway drug. I have always been a pc guy and only got the iPhone because ATTs Androids where crap at the time. I'd love to switch over completely now. Broke as ***** tho. I'd settle for a hakintosh pc and an iPad within this year.