I run one project where we wanted to implement telematic client on mobile phone and as Finnish engineer, I was years biased to Nokia. N900 was nice and I thought that I could implement something with it, but maturity of SDK and platform kept me constantly on ground.
Then I found out nice program for Android (GPL'ed), which does just what I need. Running it on Nexus one proved a case. After that, I became aware Sony ericsson X10 Mini. This combination rocks quite a bit. No wonder Nokia is lost.