You can compare all these three products here

Norton 360

Adds an additional layer of protection to detect viruses, Trojans, spyware, and other threats.

Proactively protects you by analyzing newly downloaded files and applications for threats before you install or run them on your PC.

Identifies applications that may be impacting your PC’s performance, making it easier to keep your computer running at its best.

llows you to retrieve and restore files that you backed up online anytime, anywhere, from virtually any computer with Internet access.

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Norton Internet Security 2011

Antivirus
Antispyware
Antiphishing
Norton Safe Web
Antispam
Identity protection
Norton Reputation Service
Parental control management
Smart firewall
Pulse Updates
Bot protection
SONAR 3 Behavior Protection
Network mapping and monitoring
Antirootkit

Norton AntiVirus 2011

Antivirus
Antispyware
Antirootkit
Pulse Updates
Bot protection
Network mapping and monitoring
Norton Reputation Service
SONAR 3 Behavior Protection

You can download Norton Internet Security 2011, Norton 360 Version 4.0 and Norton AntiVirus 2011 licenses valid for 3 months for free from the following links

1. Free  Norton Internet Security 2011 licenses valid for 3 months

2. Free  Norton 360 Version 4.0  licenses valid for 3 months

3. Free  Norton AntiVirus 2011 licenses valid for 3 months

These are OEM editions so you need not to activate the product using a serial number. Just download and install it