Setting up a RESTful service for Backbone.js with apache and windows

Question

I'm trying to set up a RESTful web service on my apache localhost to serve as the back-end for my backbone app. I have tried:

1. Setting up WebDAV, but get the following error messages in the logs

   [Thu Feb 23 21:46:17 2012] [error] [client 127.0.0.1] Unable to PUT new contents for /clusters/19. [403, #0], referer: http://ideas.localhost/ [Thu Feb 23 21:46:17 2012] [error] [client 127.0.0.1] An error occurred while opening a resource. [500, #0], referer: http://ideas.localhost/

2. Using Backbone.emulateHTTP, which causes a 405 method not allowed error (something I guess is caused by the X-HTTP-Method-Override: PUT header as normal POST requests are working fine

I'm running Apache 2.2.21 and PHP 5.3 on windows 7, and below is my .htaccess file. I'm also using the SLIM framework to handle url routing.

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

And virtual host config

<VirtualHost *:80>
    DocumentRoot "G:/sites/ideas"
    Dav On // I also had security setting set to Allow all as it's just my localhost
    ServerName ideas.localhost
    ErrorLog "logs/ideas.localhost-error.log"
    CustomLog "logs/ideas.localhost-access.log" combined
    SetEnv APPLICATION_ENV development
</VirtualHost>

I've been struggling to get something to work for ages, so any help greatly appreciated.