I too have a N900. If you are a geek, who enjoys fiddling with things (oooo errr missus) Who basically wants a handheld computer with phone functions then N900 all the way. Its same cpu and GPu and Iphone except you can instsall what you want on it, most of its free. Does flash. Plays all videos you cna chuck at it. As Piru said full qwerty keyboard that slids out as well as as on screen virtual keyboard.
I love it. Best phone and best Nokia ever. I would say though dont get it if you just want a normal Nokia experience phone.
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I really enjoy programming the iPhone, I don't know what Nokia's memo Linux support libraries are like, but Apple have done a great job with iPhoneOS... Though I could just be going weird, as I reallly like Obj-C
