Yes, you heard it here... straight from the Playstation Blog to you. Sony PSP 3.8 Firmware is live (they haven't updated the official PSP Firmware site yet however). Click "Read More" for the official word from John Koller Senior Marketing Manager for the PSP...

"From the PSP’s launch, we’ve been discussing its multi-functional strengths, and with the addition of Internet Radio in firmware update 3.80, PSP owners will be able to access thousands of stations in a wide range of diverse genres. Interested in Top 40 Pop? Check. Country? Check. Talk radio? Check. Ultimately, this addition speaks to how much we listen to our consumers. Music has been one of the primary uses of the PSP system, and with the addition of Internet Radio, consumers are able to access even more of their favorite artists. Enjoy.
How to use Internet Radio on PSP: