Take this as a rumour for now but our pals over at PSPIta have posted that youllbe able to use your PSP to Jailbreak the PS3, talk about a slap for Sony, heres the translated article:

Before the advent of 3:55 custom firmware for the PS3 owners the only way to change the console was to use the PS3 Jailbreak (or its clones) or a USB dongle which is made possible thanks to the code to run on non-certified PS3 Retail. This "Jailbreak" in following through the concerted efforts of many coders, was ported to other devices and made open-source ( PSGroove ). They talked for a long time even to a port on PSP but the work ended abruptly. Now, via his Twitter profile, developer Brandon Wilson announced that he was able to develop a homebrew capable PSP to make a dongle to all intents and purposes it will be possible to downgrade procedures (until 3:55 fw that turns out to be 'latest system software on which it is possible the procedure) and, with the PS3 firmware 3:41 and lower, to enable debug mode and then code execution is not certified.
Brandon Wilson said that the release is imminent. We will keep you updated when new.

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Just ported PS3 downgrader / service mode jig to PSP. You can use it for <= FW3.55 stuff. I'm cleaning it up, etc.., Will release soon.