Which should i choose to learn: AS 2.0 or 3.0?

hi… first of all let me tell you that i’m glad to be here on this forum…
my dilema is simple… just started to play around in Flash meaning that i know the basics in creating a website and a few AS 2.0 commands[made this video pack tutorial: Lynda.com Macromedia Flash Professional 8 Essential Training] and before i go even further i was wondering:
should i continue learning AS 2.0 or don’t waste any precious time and start learning AS 3.0 right away???

hope you can help a newbie like me on this one!!!
thanks in advance!!