My wife hooked me up with an archos 70 As well. I too am loving it. The first thing you are going to want to do is put the official market on it! App Lib is horrible!
Go to the "Getting Started" section at the bottom of the page for easy step-by-step directions.
No serious need to root now IMO. That may change but now there is no great benefit.
Myself: Galaxy Nexus, Droid Razr M, Nexus 7 (2013), multiple Google TVs
Wife and Kids: Galaxy Nexus, Apple iPad 4th Gen, HTC Droid DNA, Nexus 7 (2013) Galaxy Player 4.0,
Retired: Thunderbolt, Droid Pro, Fascinate, Motorola Droid 1, 3 & 4, Transformer TF101, Galaxy Tab (7" WiFi), Archos 70