Easy Comparison: HP vs. LotR

It's such an easy and obvious comparison, I'm sure there are those who have sparked discussions or written who essays on the comparisons between the Harry Potter and Lord of the Rings series.  But since I'm so new to both (having just read HP for the first time last year (4 times since that first) and I'm only currently reading LotR--I'm on The Fellowship of the Ring), I don't know if anyone has done the comparisons.....I know I can do some research on it--and I fully intend to do so--but I thought I'd go ahead and throw it out there and see what your comments are.....

• I'm already seeing a lot of similarities between Frodo and Harry
• And don't even get me started on the friendship themes within both stories. (*I must admit that this is my favorite part of HP and it's quickly becoming the most endearing part of LotR for me, too.)
• The Black Riders and Dementors
• Sauren and Voldemort---Aragorn keeps telling Frodo not to say anything having to do with Sauren, including the WHERE (Mordor) and of course we all know that Voldemort is called from the very beginning "he who must not be named"
• New/different words made up that have become a part of our natural, every-day vocabulary
• Snape & Aragorn--think about it---it's there!
• The one that's so obvious, I hate to even mention it:  Gandalf & Dumbledore
• Where Frodo and many of his friends, including the dwarves, are short (hobbits), Harry has as a very tall friend, Hagrid--this one's a bit of a stretch, but it's only the beginnings of a thought....I haven't fully processed this one (or any of these, for that matter, just this one less than the others)
• Not just made-up vocabulary, but new and exciting characters, including animals
• and just think of the fans....!!!!  Not just for the books, but for the movies, too!!!  

These are just a few of the comparisons that have come to me quickly, but I know there are many more!  What are comparisons you've noticed?  And, if you know of sources that discuss comparisons between the two, can you share?  (BTW:  I don't do Wikipedia for serious research as I'd like to do for this topic, so please don't go there.  Yes, I look at Wikipedia; of course I do.  It's just that when I'm serious about a subject, I try to avoid such an "open" and obvious web site.)  I'd like to explore this topic.....believe it or not, I DO love research and this is an awesome topic for me!!!!!!

It's also helping in my enjoyment of the LotR series as I'm reading it!  I keep seeing all these things that are wonderful connections to my other new favorite series of books:  Harry Potter.