1. What made you decide on this cooler instead of something else?
2. You always use thermal paste between a CPU and it's respective cooler. Do not ever omit this.
If I am not mistaken, the fan will go in the CPU fan connector and the pump will connect to the system fan connector
Yes, just make sure to follow the boxed install directions.
AM3 socket compatibility also includes AM3 +, correct?
I believe so, but I'm an Intel guy...someone else might be able to confirm.