Hi everyone, I purchased my first ever iPhone today - a 3G. It has iOS4, is unlocked (originally AT&T, now with Telus in Canada), and has a program called 'Cydia' on it. I've googled it but the description doesn't quite make sense to this newbie. If someone could explain (in layman's terms) the basics about Cydia, it would be greatly appreciated. Thank you kindly.