I'm currently using an iPhone 3GS and the Blackberry Bold. In general i use the bold for instant messaging (BB messenger and YM) and the iPhone for the rest (browsing, some productivity apps, entertainment, good video cam). I'm sure the N900 is very capable and I'm going to get one as soon as it's available (I'm keeping my options open as I don't believe the preorder bundle is the best deal possible yet), but I don't think it can replace the iPhone in my workflow with its super high convenience yet. So I'm really hoping to see Blackberry Connect for Maemo so I can replace the Bold with it