I imagine that Harry Potter is either high on everyone's list or not on the list at all. But for those that like them, the wait for the last book is almost over.
I haven't read too many other fantasy *series* that I like. I have a "favorite author", but I've only read two of his books and those two weren't related at all.
Oddly enough, I can't think of any SF series off the top of my head, either, that I've read. There are enough of them out there. (I'm not counting the umpteen Star Trek book lines, which I stopped reading 20 years ago or so as I couldn't keep up with them -- and because so many of them were utter garbage.)
I've read a few of Sue Grafton's alphabet books (and heard a couple on cassette in the car) and I'll probably pick up a few more during the summer.
The Lemony Snicket series finally reached The End, but it was probably several books to late.
And I have a huge collection of Doc Savage books in my basement, but I haven't read them in ages because I've been trying to read books that I can get rid of and pass along.
Okay, your turn . . . .
I turn the floor over to . . .
The Thursday Next novels by Jasper Fforde