out of the box i had problems my steps were:

get the product
# wget http://www.oxwall.org/dl/ow_1.0b2.zip
# unzip ow_1.0b2.zip
----------------------------

go to domain.com/

Error 500 - Internal server error

An internal server error has occured!
Please try again later.
-------------------------------

Realising that this PHP4 version might be out of date , i change .htaccess

FROM:

Options +FollowSymLinks
RewriteEngine On
#RewriteCond %{REQUEST_FILENAME} !-f
#RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/index.php
RewriteCond %{REQUEST_URI} (/|\.php|\.html|\.htm|\.feed|\.pdf|\.raw|/[^.]*)$ [NC]
RewriteRule (.*) index.php

TO:
AddType x-mapp-php5 .php
AddHandler x-mapp-php5 .php

Options +FollowSymLinks
RewriteEngine On
#RewriteCond %{REQUEST_FILENAME} !-f
#RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/index.php
RewriteCond %{REQUEST_URI} (/|\.php|\.html|\.htm|\.feed|\.pdf|\.raw|/[^.]*)$ [NC]
RewriteRule (.*) index.php

get the same result with PHP5, since i am using a Vhosting package I also had to add another line.

RewriteBase /

The new .htaccess file that i'v am testing on 1&1 virtual servers is :
------------------------------------------------------------------
[code]

AddType x-mapp-php5 .php
AddHandler x-mapp-php5 .php

Options +FollowSymLinks
RewriteEngine On
RewriteBase /
#RewriteCond %{REQUEST_FILENAME} !-f
#RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/index.php
RewriteCond %{REQUEST_URI} (/|\.php|\.html|\.htm|\.feed|\.pdf|\.raw|/[^.]*)$ [NC]
RewriteRule (.*) index.php

[/code]

now when i got to domain.com/ i see "Oxwall software installation"

yay !