I've successfully installed and ran
Android on my
N810 following the instructions
here along with the modifications described
here. In the next days/weeks I'll have a deeper look at it and will also try to install some more apps.
There is another project (involving the same people?) called
NITdroid, which allows to run Android directly, bypassing Maemo. However my understanding is that short of reflashing the kernel there is no easy way to switch between Maemo and Android (with the first method you only have to reboot to get back to Maemo after using Android). There are discussion here and there about using
kexec to swich between Maemo and Android but so far I'm not aware of anybody getting kexec to work on a NIT.
android-n810 on SourceForge looks quite similar to NITdroid, according to the README in the distributed files.
Other things to look at some day:
