Sony has posted over on the US PS Blog that due to a few hiccups, LittleBigPlanet PSP is not available through the store on PSN just yet.
However, it's being remedied.
"We’re currently working around the clock to get this issue worked out so keep your eyes peeled for updates this week," said senior producer Mark Green. "We appreciate you bearing with us".
Just hang tight a bit longer then, we reckon.
More through the link.