It's a shame you can't copy them over, but then again, with the ability to turn the PS3 on and off via Remote Play, the PS3 acts just like a Slingbox, allowing you to watch your recorded shows anywhere you can get an internet connection.
So for example... if you were on holiday in the US for 2 weeks, you wouldn't be able to copy your recordings to the PSP anyway. At least this way, you can still watch them in your hotel room in the evening, instead of having to watch the US channels, sitting around bored, or worse... having to talk to the mother-in-law!
http://www.playtvps3.com/en_GB/