Earlier this year when I tried to install Hardy with wubi it gave an error saying 'atleast 256 MB required for the installer'. Now my PC has 256 MB so, this error seemed fishy.This will keep away new users of Ubuntu who wanted to try Ubuntu because of Wubi.
Wubi can run on less than 256MB Ram so remove the check. If I didn't have internet I wouldn't have been able to use Ubuntu.
To run Wubi on less than 256MB RAM do this:
http://iampriteshdesai.blogspot.com/2008/06/install-ubuntu-hardy-heron-on-pc-wi th.html
Developer comments
In Wubi 8.04.1 the memory check is now only a warning, and the user can decide to continue with the installation anyway.