As promised, 5.0 SP1 W1 is available for download.
Versions W1 (WorldWide), DK (Danish), DE (German) and US are available at this moment.
These are the other release dates: Group 1 (GR1) countries are expected to release 7th May 2008
Group 2 (GR2) countries are expected to release 17th June 2008 - No UA (online help)
Group 2 (GR2) countries are expected to release 14th August 2008 - Incl. UA (online help)
I did see the pages on partnersource, but I was at a customer, so I didn't download it yet. Now, PS is off line ... . Too bad indeed.