@lma: chances are if you go somewhere that you need to swap SIM Cards to, you won't be going there on a daily basis anyway.
And chances are you'd have enough time to do so in the airplane\ship\bus\train\etc too.

I think the slide-to-unlock on N900 is kind of pointless though.. the one on iPhone is located right under your thumb when you hold it in portrait mode. Thus when you want to turn it on, you make the gesture to click (the home button) and flick from left to right right above it... all in a single continuous gesture. I don't think this is the case on the landscape-oriented N900.

PS: 33 seconds boot time is nothing really. As long as the device is stable.