The component/composite cables are nice to have. I bought that too. The PSP screen is way better to play on than a TV though. Mine just sits around and collects dust. Even when I watch ripped shows and movies, I still like watching laying down on a couch or bed with the PSP. Having it hooked up to the TV means you have to sit close to the TV and have no remote functionality if you let it sit in front of the TV while you lay down on the couch. The PSP is an awesome media player, the fast forward and rewind and scene jumping options are very nice.
These cables are still worth a buy though. It's nice to have both composite and component on the same cable and it's way cheaper than the Sony branded ones. Pretty good quality too:
http://www.superufo.com/product_html/SONY_PSP_PSP_2_in_1_Component_Composite_AV_Cable.html
Also if your going on long trips without power nearby, I would get the high capacity battery.
