Can I use my AC/USB charger and car charger cables from my Verizon Fascinate with my new Galaxy Nexus? I hate to buy more cables. I have no idea what the specifications are for either. Can anyone help me figure this out?
Actually, the phone won't pull more current than it can handle. It's much safer to build that into the phone than to have dedicated, specific chargers. This is why using my 1000mA+ chargers on my Bluetooth headset (which would be lucky to be able to pull 500mA) works just fine. You may not be able to use the full power of a 2A car charger with the current phone, but at least it's there for whatever comes next.
I think you know the answer to that - it's cheaper!
Hopefully larger power converters will become more commonplace soon enough. The existing adapters work fine under normal usage, but streaming Flash videos or running the GPS can still out power them.