Managed to get Opera running on my OS2008HE 770, made a deb and tested it on my N800 - works. Posting here Tell me if it works for you.
The downside is that it managed to drag a big chunk of the filesystem with it... So if you can sacrifice 20MB for an old, crappy and fast browser, be welcome

Pros:
* Fast.
* Not too memory hungry.

Cons:
* Big (on OS2007 it is 5MB, but on OS2008 almost 20MB ). Entirely my fault, blame me.
* Theme is not working (needs a separate sapwood-server for that, if someone can tell me how to run a second sapwood-server - i'm all ears)...
* Old and can't open newer sites (like internettablettalk.com default theme for instance).
* No Flash (too late here for that now).

* I was warned (not by Opera) that there may be licensing issues and I also think so, so i'm removing the file for now. *

P.S. Almost forgot - if you manage to break your OS install - don't blame me. I'm not installing any libs in /usr/lib anyway.