Threespeech mentioned that there'd be some exciting news for the Playstation Store, and it seems like they may have been right.
"Over the next few weeks, some new and exciting changes will take place in the PLAYSTATION®Store. In preparation for this, both PLAYSTATION®Network and PLAYSTATION®Store need to be taken offline for a short while to allow us to carry out the upgrade and maintenance work.
This is scheduled to take place between 16:00 and 19:00 BST (17:00-20:00 CEST) on Tuesday 8th May 2007.
We are hoping to complete this work in as short a time as possible and apologise for any inconvenience this may cause. But remember that these enhancements are paving the way for new and exciting content that we have planned for the Store!"