What are some cool things to look at in my telescope?

I've seen the moon, Venus, and one time I saw a star with a little cloud around it and thought it might've been a nebula. Besides those things, I can't find anything else interesting besides little stars that llok like specks. What cool things are there to look at? F.Y.I. I'm in the northern hemisphere. This is my telescope a href="http://www.celestron.com/c3/product.php?CatID=62&ProdID=426" rel="nofollow"http://www.celestron.com/c3/product.php?…/a