I agree with all the above - I never charge mine using the PC - its not eco friendly as the PC has to be on as well (well mine does).
The PSP charger is a good idea although I went to play and got one of these and this is fantastic and no where near as bulky as the PSP charger
http://www.play.com/Games/PSP/4-/598...P/Product.html
£6.00 and no delivery charge. - well worth it