good article that claims that the psp could be running at 222mhz instead of 333mhz so as to conserve battery power, until they figure out how to make a better battery.
At which time they will release a new psp with the new battery, and the cap removed. And owners of the early models can buy a new battery and get firmware to remove the processor cap?
Although this notion is likely a conspiracy theory. I guess though it is a possibility and theirs “never smoke without a fire”. (unless you have a smoke machine ;) )
http://gamesradar.msn.co.uk/news/default.asp?pagetypeid=2&articleid=35400&subsectionid=1591