The definitive HP quiz

The final HP movie is being released in about 3 weeks. So it is time to dust up those old quills and practice those memory charms- the definitive HP quiz is here!

Rules:
1. No googling the answers! (Yes, that means no binging and no yahooing either). If you are sorely tempted, you can google to verify your guess, perhaps. Referring the books is allowed.
2. Try not to build on the earlier comments and try answering all questions yourselves- this will allow me to score properly and announce the CHAMP ("Comprehensively Harry Aware Muggle" Prize).

1. His name in Latin means 'unknown', which is appropriate because of his unique accomplishment. Who is this?
2. Never tickle a sleeping what?
3. Through the use of this magical device, Harry discovers many hidden truths about his parents' death and new powers in himself, but destroys all such devices by accident later. What is the device?
4. Name 3 things that you can find at Borgin and Burkes?
5. What are the 2 spells that help protect the treasure in Bellatrix's vault at Gringotts? What is the effect?
6. He is half-Kneazle, as evidenced by his lion-like appearance, ability to solve problems on his own without aid or teaching, and clear dislike of and ability at recognizing untrustworthy persons (even if they are transfigured). Who is this?
7. What is the final resting place for the elder wand?
8. This place has beds, curtained windows, candles in brackets next to the beds and you can buy hot chocolate, hot water and toothbrushes of any color. But be careful with the hot chocolate, as it is very likely to spill before you drink it. What is this place?
9. What is the only beast in the HP series that can talk English?
10. It is silvery in color. It will keep one from dying even if one is an inch from death, but then the person's life would be a cursed one. What am I talking about?
11. One of Hermione's finest characteristics is her stand against discrimination and her determination to judge a person by merit and not his/her creed. The SPEW and her stand against house-elf slavery is one example. What is another example where she tries to protect an individual's reputation from normal wizard prejudice?
12. I am nice as long as you play the harp to me, but if you stop, I am triple trouble! Who am I? 
13. What does Dumbledore see in the Mirror of Erised? 
14. Name three gifts that Harry gets on his 17th 'coming of age' birthday (apart from what Dumbledore's wills him)
15. This was the only known time ever that a student asked a question in this boring class and the only time the class was interested in what the teacher was to say. Who was the teacher, student and what was the question?
16. 3 things that you will encounter or see on the way to the Lestrange vault at Gringotts
17. Tonks’s patronus changes shape from its normal form in the 5th book- why does that happen? For whom else does this happen?
18. What does Ron describe as the trio’s finest hour?
19. When Dumbledore invites Harry to step into the night and pursue a 'flighty temptress', who is he referring to?
20. This berry tree bears white flowers (see pic) and has a strong connection with the HP series. The elders of pagan European tribes say that if you cut this tree, its spirit would be released and would take revenge on you. What is it?

Happy Quizzing, Muggles!