If you want to go beyond just changing what is reported as the user agent, then you can actually switch to the webkit render engine...
The n900 version is probably in extra-devel so be careful... I know with my n8x0 tablets that you can install the webkit render engine (I think that the package is webkit-eal) and use the included utility to change render engines between microb and webkit.
Alternatively, (also probably in extras-devel) you can use Tear or Midori which are both webkit-based browsers.