I saw this pointed out today and had to share.  With SharePoint Service v3 & 2007 you can enable simple mobile access.  This is covered in the Knowledge Base article Mobile browsers and devices that are supported in Windows SharePoint Services 3.0 and in SharePoint Server 2007 of which the key items are:

INTRODUCTION

This article discusses the mobile browsers and devices that are supported in Microsoft Windows SharePoint Services 3.0 and in Microsoft Office SharePoint Server 2007. Mobile pages refer to the pages that you can access by using any of the following URLs:

• http://URL/m/
• http://URL/_layouts/mobile/default.aspx

Note To use the http://URL/m/ URL, you must enable it by using the following command:

stsadm -o activatefeature -name MobilityRedirect -URL http://URL

By default, the http://URL/_layouts/mobile/default.aspx URL works without any additional enabling.

I saw this when David Copeland posted this to a question on an internal alias, so thanks to David for pointing it out.

ttfn

David