listed without www and with www

Should I be worried?

[SpikeyRob]

I noticed yesterday that I'm listed on google twice. Once as mysite.com and once as www.mysite.com. I checked the cache on both of them, and mysite.com is outdated, while www.mysite.com isn't.

How did this happen? I don't have many backlinks yet, and as far as I know, they all point to www.mysite.com.

How do I fix this, and is it worth fixing? Will my PR or ranking be effected by this? I just don't want to make my site drop out of google entirely, it is bad enough being sandboxed as it is, I don't want to have to wait even longer to get out of the sandbox.