Looks like a half decent site. It's still in "beta" but there's a lot of good stuff there to help the beginner.
Of course my real tip here for Ubuntu users or indeed any PC user is to use the web to it's maximum potential. There's so much "free" information out there. There's really no excuse save being dead for not knowing how to do things for yourself.
Here's another great page. http://ubuntulinuxtipstricks.blogspot.com/