i was actually signing on to write a post about the D5000 i received in the mail today. my girlfriend has been using my D50 until now but she's been unhappy with the poor ISO performance above ISO400. so i ordered her a D5000 yesterday, got it today and started playing with it.
first thing i can say is i really though the D5000 was in the same league as the D90, but it's truly not. not even close. as far as basic image quality they are identical. ISO performance is good, IQ is good, metering sucks compared to the D90 and i can't figure out hot to shoot continuous. the D5000 has basically no dedicated controls which drove me insane.
i would consider the D5000 more of an enhanced D60 than a stripped down D90. i thought i could use the D5000 as my second body when my girlfriend isn't with me but so far i really prefer the D50 over the D5000.