Just installed my iPad 2, next-gen.. Looks a lot smaller in white, nice smart cover. I'm glad it's more lightweight than the iPad 1, much more easy to read longer times.
Thinking of picking up an N900. The N8 is staying forever but I fancy something different on the side. Have been thinking tablet but an N900 could be as much fun.
I think the N900 is a step back from all modern phones now.
The device is pretty much dead, only a few hardcore developers are still making stuff for it. There is a community firmware now that solves a few frustrating issues. And then there is Android: Nitdroid (android for nokia internet tablets). That still doesnt have call/sms functionality though, but I am quite sure that will come one day.
The biggest plus of the N900 is the software architecture. Lots of linux programs could work in theory if someone mods them to build on the phone.
For geeks like me it is still pretty cool. Remote commandline (SSH) to install apps from my pc. Easy overclocking, lots of mods / hacks possible.
But I think every Android can do the same, I wouldnt advice you buying it. Its a dated phone which had loads of potential instead of hard features.