Harry Potter is awesome (although I listen to Stephen Fry read to me more frequently than reading myself). Anything by Tamora Pierce, but her Protector of the Small quartet is the best. LM Montgomery made my life when I was a kid. The Blue Castle is my favorite of hers that I've been meaning to re-read.
My favorite when I have to name one is "Bet Me" by Jennifer Crusie. The rest of her stuff is fantastic too. I also love Ilona Andrews' Kate series and Patricia Briggs' Alpha and Omega/Mercy Thompson series. I also love a lot of romance authors like Sarah Maclean and Tessa Dare.
Re: Go-To Books?