Hi,
Please refer to these blog posts/sites:
Early Look at CRM 5: http://blogs.msdn.com/crm/archive/2008/12/18/an-early-look-at-crm-5.aspx
Integrate CRM 5 - the benefits: http://www.microsoft.com/dynamics/crm/product/5benefitsofcrm.mspx
CRM 5 - Secure code on server: http://channel9.msdn.com/posts/benriga/CRM-5--Secure-Code-on-the-Server/
Here are great discussion of CRM 5
http://ronaldlemmen.blogspot.com/2008/10/crm-50-features.html
http://demiliani.com/blog/archive/2008/11/11/6526.aspx
http://www.gilham.org/Blog/Lists/Posts/Post.aspx?List=aab85845%2D88d2%2D4091%2D8088%2Da6bbce0a4304&ID=356
http://blogs.msdn.com/ukcrm/archive/2008/11/10/what-s-new-in-crm5.aspx
Regards,
Imran