Is there any other way to charge the wireless remotes other than connecting them to console via USB while the machine is on? Is there something that can be plugged into an outlet so that it can charge while the console is off?
Also, why can't PS2 games be played with the wireless remotes?
If you search you will find a rather long thread around here somewhere, but in short it's just a USB port. I use my cable STB which has an always powered USB port, but you can use the same cable in a PC. I believe that a cellphone charger (aka the RAZR) that plugs into a/c should work also.
Does it actually charge them? I plugged on of mine into the Wii and all four lights blinked on the Sixaxis. Not sure if it's actually charging though.
Yes it does. As long as you see a yellow/green light on the Wii that means it will charge. When the lights are blinking on the controller it is charging. When your ps3 is off all four lights will blink on the controller. but when the ps3 is on only the light for the player # the controller is assigned to will blink.