I'm not sure if anyone has try it yet.
From what I can see it seems possible?

I came across this thread showing instructions how to install applications with .deb file extension onto the iPhone.

On the site also contains several iPhone applications that are in .deb file format.
Here is an example app, the biteSMS application is very useful to cut cost on sending SMS. Would love to get this to work on the N900.

My question is, can we get these .deb files and install onto our N900?

I have read N900 - Changes to app manager and it seems Nokia removed Application manager's support to install local .deb files. Is there a workaround?

May I dare say, an iPhone emulator to run iPhone apps on the N900?