A pre-relase version of Microsoft Dynamics NAV 2009 is now available on PartnerSource (login required) from this link:
Marketing Beta for Microsoft Dynamics NAV 2009
One of the main purposes of this release is to help partners building up readiness and familiarity with NAV 2009. The link above also contains various other information like:
Microsoft Dynamics UK
Microsoft Customer Service and Support (CSS) EMEA
These postings are provided "AS IS" with no warranties and confer no rights. You assume all risk for your use.