http://blogs.zdnet.com/microsoft/?p=3053

http://www.cmswire.com/cms/enterprise-cms/sharepoint-online-saas-review-what-it-is-and-isnt-004351.php

Sharepoint 2007 has some good premises for SaaS like software deployment.

One of these would be the permissions the user has to only view/edit and delete the own items in a list. Imagine a HelpDesk or a CRM where a Company only "sees" it's own stuff, and within the company each user his/her own.

How could it be even better?

If it was easier to set item level permissions to isolate and restrict different Sharepoint groups to be able to see only their "items" in a list and each user in the group only his/her own, bar the groups admin seing all of the groups items.

That would make Sharepoint Saas by default.

SSP

MySite

Personal Views

Sites provisioning

What else?

SOA + SaaS (via http://blogs.msdn.com/giuseppeguerrasio/archive/2007/03/13/is-soa-essentially-software-as-a-service-contained-within-the-enterprise-walls.aspx )

http://blogs.zdnet.com/service-oriented/?p=825

http://entmag.com/news/article.asp?EditorialsID=8101
http://blogs.zdnet.com/microsoft/?p=168
http://www.cioinsight.com/article2/0,1540,2077373,00.asp
http://microsoftcrm3.blogspot.com/
http://www.infoworld.com/article/07/01/10/HNmicrosoftnextcrm_1.html
http://blogs.msdn.com/crm/archive/2006/10/30/the-road-to-compatibility-vista-and-office-2007.aspx
http://blogs.inetium.com/blogs/rtoenies/archive/2006/08/22/339.aspx
http://www.cio-weblog.com/50226711/microsoft_dynamics_titan_in_preview.php
http://blogs.msdn.com/ukcrm/archive/2006/08/17/704196.aspx

BTW, my employer builds a Sharepoint based CRM, for a enterprise CRM MS Dynamics CRM 4 is more appropriate.