Sony issued a short statement that the Sony Playstation Home Beta has started. Only Sony staff and known beta testers are supposedly currently wandering through the new virtual world.

The beta test will be opened up to many others at some point during the summer, including those registered on the site.
This means most of us have still to wait until we might be able to get access to the Playstation Home virtual world and stake our claim.
See this video showing how the Sony Playstation Home will be like.